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  • 101
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 867-878 
    ISSN: 0044-2313
    Keywords: Chemical vapour transport of W ; thermochemical calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Chemical Transport of Tungsten using HgBr2 - Experiments and Thermochemical CalculationsUsing HgBr2 as transport agent tungsten migrates in a temperature gradient from the region of higher temperature to the lower temperature (e.g. 1 000 → 900°C). The transport rates were measured for various transport agent concentrations (0.64 ≤ C(HgBr2) ≤ 11.74 mg/cm3; T̄ = 950°C) and for various mean transport temperatures (800 ≤ T̄ ≤ 1 040°C). Under these conditions tungsten crystals were observed in the sink region.To observe the influence of tungsten dioxide (contamination of the tungsten powder) on the transport behaviour of tungsten, experiments with W/WO2 as starting materials were performed.According to model calculations the following endothermic reactions are important for the migration of tungsten: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} {\rm W}_{\rm s} + 5/2\,{\rm HgBr}_{2.{\rm g}} = {\rm WBr}_{5,{\rm g}} + 5/2\,{\rm Hg}_{\rm g}\\ {\rm W}_{\rm s} + 2\,{\rm HgBr}_{2,{\rm g}} = {\rm WBr}_{4,{\rm g}} + 2\,{\rm Hg}_{\rm g}\\ \end{array} $$\end{document} In the presence of H2O or WO2 other equilibria play a role, too.Using a special “transport balance” we observed a delay of deposition of tungsten (e.g. T̄ = 800°C; 15 h delay of deposition) with W and W/WO2 as starting materials.The heterogeneous and homogeneous equilibria will be discussed and an explanation for the non equilibrium transport behaviour of tungsten will be given.
    Notes: Mit HgBr2 als Transportmittel wandert Wolfram in geschlossenen Quarzglasampullen im Temperaturgefälle in die weniger heiße Zone (z. B. 1 000 → 900°C). Im gesamten untersuchten Temperaturbereich (800 ≤ T̄ ≤ 1 040°C) als auch bei einer Variation der Transportmitteldichte (0,64 ≤ C(HgBr2) ≤ 11,74 mg/cm3; T̄ = 950°C) wurden die Transportraten bestimmt. Stets hatte sich nur kristallines metallisches Wolfram als einphasiger Bodenkörper in der Senke abgeschieden.Um den Einfluß oxidischer Verunreinigungen zu simulieren, wurde die Temperaturabhängigkeit der Transportrate (800 ≤ T̄ ≤ 1050°C) in Vergleichsexperimenten mit heterogenem Ausgangsbodenkörper (W/WO2) ebenfalls untersucht.Nach dem Ergebnis der Experimente sowie begleitender Modellrechnungen sind die für das Transportgeschehen maßgeblichen heterogenen Gleichgewichte: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} {\rm W}_{\rm s} + 5/2\,{\rm HgBr}_{2.{\rm g}} = {\rm WBr}_{5,{\rm g}} + 5/2\,{\rm Hg}_{\rm g}\\ {\rm W}_{\rm s} + 2\,{\rm HgBr}_{2,{\rm g}} = {\rm WBr}_{4,{\rm g}} + 2\,{\rm Hg}_{\rm g}\\ \end{array} $$\end{document} Daneben spielen weitere heterogene Gleichgewichte - insbesondere in Gegenwart von WO2 bzw. H2O - eine wenn auch nur untergeordnete Rolle.Unabhängig vom Ausgangsbodenkörper (W oder W/WO2) konnten aufgrund kontinuierlicher Messungen der Transportraten mit der sog. „Transportwaage“ zu niedrigen mittleren Temperaturen hin Ungleichgewichte nachgewiesen werden. Aus der Aufzeichnung der Massenänderung mit der Zeit ist klar erkennbar, wenn die Abscheidung des Metalls stark verzögert einsetzt, so z. B. erst nach 15 h bei T̄ = 800°C.
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  • 102
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 879-881 
    ISSN: 0044-2313
    Keywords: Strontium peroxide ; crystal structure ; composition ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Refinement of the Crystal Structure of SrO2Single crystals of SrO2 have been obtained after high pressure/high temperature reaction of a SrO/KClO3 mixture at 20 kbar, 1 400°C. The crystal structure was refined using 154 unique diffractometer data (I4/mmm; a = 3.5626(3), c = 6.6159(6) Å; Z = 2; R = 0.033, Rw = 0.022, S = 0.932). The O—O distance (1.493(4) Å) is significantly longer than the one previously assumed. From a refinement of the site occupation factor for oxygen a composition SrO1.95(2) has been found for the crystal investigated.
    Notes: Einkristalle von SrO2 wurden durch Hochdruck-Hochtemperatur-Reaktion eines SrO—KClO3-Gemisches bei 20 kbar, 1 400°C erhalten. Die Kristallstruktur wurde auf der Basis von Vierkreisdiffraktometerdaten (154 unabhängige Strukturfaktoren) verfeinert (I4/mmm; a = 3,5626(3), c = 6,6159(6) Å; Z = 2; R = 0,033, Rw = 0,022, S = 0,932). Der gefundene O—O-Abstand ist mit 1,493(4) Å deutlich größer als bisher angenommen. Eine Verfeinerung des Besetzungsfaktors von Sauerstoff ergab für den untersuchten Kristall eine Zusammensetzung SrO1,95(2).
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  • 103
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 882-887 
    ISSN: 0044-2313
    Keywords: K6[Al2O6], Rb6[Al2O6] ; preparation ; crystal structure ; MAPLE ; CHARDI ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of Crystal Structure of K6[Al2O6] and Rb6[Al2O6]Colourless single crystals of K6[Al2O6] have been prepared from intimate mixtures of KAlO2 and K2O (550°C, 90 d). The structure determination from four-circle diffractometer data (MoKα, 742 Io(hkl), R = 2.2%, Rw = 2.1%) confirms the space group C2/m with Z = 2; a = 698.25 pm, b = 1 103.54 pm, c = 646.49 pm, β = 102.49°.Colourless single crystals of hitherto unknown Rb6[Al2O6] have been prepared from intimate mixtures of RbAlO2 and Rb2O (520°C, 120 d). The structure determination from four-circle diffractometer data (MoKα, 1 240 Io(hkl)) results in the residual values R = 7.2%, Rw = 4.9%; space group C2/m; a = 725.92 pm, b = 1 143.33 pm, c = 678.06 pm, β = 104.05°; Z = 2.K6[Al2O6] and Rb6[Al2O6] are isostructural with K6[Fe2O6]. A characteristic structure unit is the anion [Al2O6]6- consisting of two edge-sharing [AlO4] tetrahedra.Effective Coordination Numbers (ECoN), Mean Fictive Ionic Radii (MEFIR), the Madelung Part of Lattice Energy (MAPLE) and the Charge Distribution (CHARDI) are calculated and discussed.
    Notes: Farblose Einkristalle von K6[Al2O6] wurden aus innigen Gemengen von KAlO2 und K2O erhalten (550°C, 90 d). Die Strukturaufklärung (Vierkreisdiffraktometer, MoKα, 742 Io(hkl), R = 2,2%, Rw = 2,1%) bestätigt die Raumgruppe C2/m mit Z = 2; a = 698,25 pm, b = 1 103,54 pm, c = 646,49 pm, β = 102,49°.Analog erhielten wir erstmals Rb6[Al2O6] aus RbAlO2 und Rb2O in Form farbloser Einkristalle (520°C, 120 d). Die Strukturaufklärung (Vierkreisdiffraktometer, MoKα, 1 240 Io(hkl)) ergab in C2/m die Residualwerte R = 7,2%, Rw = 4,9%; a = 725,92 pm, b = 1 143,33 pm, c = 678,06 pm, β = 104,05°.K6[Al2O6] und Rb6[Al2O6] sind mit K6[Fe2O6] isotyp; charakteristische Strukturelemente sind die Anionen [Al2O6]6-, die aus zwei kantenverknüpften [AlO4]-Tetraedern bestehen.Effektive Koordinationszahlen (ECoN), Mittlere Fiktive Ionenradien (MEFIR), der Madelunganteil der Gitterenergie (MAPLE) sowie die Ladungsverteilung (CHARDI) werden berechnet und diskutiert.
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  • 104
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1422-1426 
    ISSN: 0044-2313
    Keywords: Trinuclear molybdenum sulfur clusters with HgI2 ; dithiophosphinato Mo—S—Hg clusters, crystal structure, 31P NMR studies of trinuclear Mo—S—Hg clusters ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Peripheral Bonding of Mercury(II) Iodide to Trinuclear Molybdenum-Sulfur-Dithiophosphinato Clusters: [Mo3S4(R2PS2)4HgI2] (R = Et, Pr)Reaction of Mo3S4(R2PS2)4 1 (a: R = Et, b: R = Pr) with HgI2 in THF yields the diamagnetic title complexes [Mo3S4(R2PS2)4HgI2] 3. The crystal structure of [3a (H2O)] · 2 CH2Cl2 shows the complexes to consist of a triangular array of Mo atoms which are bridged by μ2—S atoms and capped by a μ3—S atom. Each of the Mo atoms is chelated by a dithiophosphinato ligand Et2PS2- and in addition two Mo atoms are bridged by a Et2PS2- ligand while the H2O molecule is bonded weakly to the third Mo atom. Thus, all Mo atoms reveal a distorted octahedral coordination sphere. HgI2 is „peripherally“ bonded to the cluster via two S atoms, one of which belongs to a chelating ligand and the other one to the bridging ligand. Space group P1, lattice constants a = 12.157(2), b = 15.284(3), c = 16.049(3) Å, α = 115.56(1), β = 107.35(1), and γ = 94.62(1)°; Z = 2, dcalc = 2.23 mg/mm3; 4 236 observed reflections, R = 0.068. In organic solvents complexes 3 are strong electrolytes. VT-31P NMR data suggest a stepwise dissociation of 3 with formation of [Mo3S4(R2PS2)3] +[(R2PS2)HgI2]- and elimination of the bridging ligand from the cluster.
    Notes: Die Reaktion von Mo3S4(R2PS2)4 1 (a: R = Et, b: R = Pr) mit HgI2 in THF ergibt die diamagnetischen Komplexe [Mo3S4(R2PS2)4HgI2] 3. Die Kristallstrukturanalyse von [3a (H2O)] · 2 CH2Cl2 zeigt eine triangulare Anordnung der Mo-Atome, die durch μ2—S-Atome verbrückt und durch ein μ3—S-Atom überdacht sind. Jedes Mo-Atom ist durch einen Dithiophosphinatoliganden Et2PS2- chelatisiert, ein weiterer Et2PS2--Ligand verbrückt zwei Mo-Atome, während ein H2O nur schwach an das dritte Mo-Atom gebunden ist. Somit ist jedes Mo-Atom verzerrt oktaedrisch koordiniert. HgI2 ist „peripher“ an den Cluster über je ein S-Atom eines Chelatliganden und des Brückenliganden gebunden. Raumgruppe P1, Gitterkonstanten a = 12,157(2), b = 15,284(3), c = 16,049(3) Å, α = 115,56(1), β = 107,35(1) und γ = 94,62(1)°; Z = 2, dber = 2,23 mg/mm3; 4 236 beobachtete Reflexe, R = 0,068. In organischen Lösungsmitteln sind die Komplexe 3 starke Elektrolyte. Gemäß VT-31P-NMR-Messungen wird eine schrittweise Dissoziation von 3 vorgeschlagen, wobei sich unter Eliminierung des Brückenliganden aus dem Cluster [Mo3S4(R2PS2)3] +[(R2PS2)HgI2]- bildet.
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  • 105
    ISSN: 0044-2313
    Keywords: Methylene bridged dialuminium compounds ; reaction with LiCH(PMe2)2 ; Al2C2P heterocycle ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reaction of [(Me3Si)2CH]2Al—CH2—Al [CH(SiMe3)2]2 with LiCH(PMe2)2; Formation of a Five-membered Al2C2P HeterocycleThe recently synthesized methylene bridged dialuminium compound [(Me3Si)2CH]2Al—CH2—Al [CH(SiMe3)2]2 3 reacts with one equivalent of LiCH(PMe2)2 in the presence of TMEDA to give an adduct with one aluminium atom coordinated by the carbanionic carbon atom and the second one coordinated by one phosphorus atom. A five-membered heterocycle 5 is formed, which was characterized by a crystal structure determination showing a strongly bent ring with the phosphorus atom located above the plane of the four remaining atoms (Al2C2). 5 is unstable in ethereal solution decomposing under ether cleavage to the educt 3 and the diphosphinomethane derivative CH2(PMe2)2.
    Notes: Die methylenverbrückte Dialuminiumverbindung [(Me3Si)2CH]2Al—CH2—Al [CH(SiMe3)2]2 3 reagiert mit einem Äquivalent LiCH(PMe2)2 in Gegenwart von TMEDA unter Anlagerung des carbanionischen Kohlenstoffatoms und eines der beiden Phosphoratome an seine beiden ungesättigten Metallatome. Dadurch entsteht ein fünfgliedriger Al2C2P-Heterozyklus 5, der im Festkörper eine sehr starke Winkelung aufweist. 5 ist in etherischer Lösung nicht beständig und ergibt unter Etherspaltung neben dem Edukt 3 das Diphosphanomethan CH2(PMe2)2.
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  • 106
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1434-1438 
    ISSN: 0044-2313
    Keywords: Spiro compounds ; phosphazenes ; phosphorus hydrazine heterocycles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Substitution Products of 4,4,6,6-Tetrachloro-6′-phenoxy-6′ -thioxo-cyclotriphosphazene-2-spiro-3′-cyclodi(phosphadiazane)Reactions of the spiro compound 4,4,6,6-Tetrachloro-6′-phenoxy-6′-thioxo-cyclotriphosphazene-2-spiro-3′-cyclodi(phosphadiazene) Cl4N3P3(NH—NH)2P(S)OC6 H5 with an excess of ammonia, cyclopropylamine, aziridine, and sodium phenolate were investigated. Fully or partially substitution of the chlorine atoms occurs. The reaction with two equivalents of the aziridine yields a mixture of isomers which consists of two geminal and two vicinal disubstituted products.The constitutions of the substituted compounds were confirmed by IR, NMR, MS and elemental analyses.
    Notes: Reaktionen der Spiroverbindung 4,4,6,6-Tetrachlor-6′-phenoxy-6′ -thioxo-cyclotriphosphazen-2-spiro-3′-cyclodi(phosphadiazan) Cl4N3P3(NH—NH)2P(S)OC6 H5 mit Ammoniak, Cyclopropylamin, Aziridin und Natriumphenolat werden untersucht. Sie führen zu teilweiser oder vollständiger Substitution der Chloratome am Phosphazenring. Die Umsetzung mit zwei äquivalenten Aziridin ergibt ein Isomerengemisch, das aus zwei geminal und zwei vicinal disubstituierten Produkten besteht.Die Konstitutionen der Substitutionsprodukte werden durch IR-, NMR- und Massenspektren sowie durch Elementaranalysen belegt.
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  • 107
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1439-1442 
    ISSN: 0044-2313
    Keywords: Nitridophthalocyaninatorhenium(V) ; Uv-vis spectra, m.i.r. spectra, f.i.r. spectra, resonance Raman spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Spectroscopical Properties of Nitridophthalocyaninatorhenium(V)Nitridophthalocyaninatorhenium(V) ([ReNPc2-]) is prepared by the reaction of dirheniumheptoxide with ammoniumiodide in molten 1,2-dicyano-benzene. The diamagnetic complex is chemically und thermically extremely stable. In the Uv-vis spectra the typical π-π*-transitions of the Pc2- ligand are observed. Extra bands in the solid state spectrum are due to strong excitonic coupling of ca. 2.8 kK. In the resonance Raman spectra the intensity of the Re≡N stretching vibration (v(Re≡N)) at 969 cm-1 is selectively enhanced by laser excitations above 19.0 kK. v(Re≡N) is a dominant m.i.r. absorption at 976 cm-1.
    Notes: Nitridophthalocyaninatorhenium(V) ([ReNPc2-]) wird durch die Reaktion von Dirheniumheptoxid mit Ammoniumiodid in geschmolzenem Phthalodinitril dargestellt. Der diamagnetische Komplex ist chemisch und thermisch ungewöhnlich stabil. Im UV-VIS-Spektrum treten die typischen π-π*-Übergänge des Pc2--Liganden auf. Die Extra-Banden im Feststoffspektrum werden durch die starke Excitonen-Kopplung von ca. 2,8 kK hervorgerufen. In den Resonanz-Raman-Spektren wird bei der Anregung oberhalb von 19,0 kK bevorzugt die Intensität der Re≡N-Valenzschwingung (v(Re≡N)) bei 969 cm-1 verstärkt. v(Re≡N) wird als starke MIR-Absorption bei 976 cm-1 beobachtet.
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  • 108
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1449-1454 
    ISSN: 0044-2313
    Keywords: Lead fluoroaluminate ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pb3Al2F12: Kristallstruktur eines mit zu Ba3Al2F12 verwandten cyclo-FluoroaluminatDas Fluoroaluminat Pb3Al2F12 wurde in Form von Einkristallen durch Hydrothermal-Synthese erhalten und kristallisiert monoklin in P 21/n mit a = 9,435(6) Å, b = 9,610(5) Å, c = 10,100(9) Å, β = 90,59(5)°, V = 915,7(2) Å3, Z = 4, MoKα, λ = 0,71073 Å, R = 0,0463, Rw = 0,0465, 3 044 symmetrieunabhängige gemessene Reflexe. Die Struktur zeigt tetramere, isolierte, von einem Unternetzwerk unabhängiger Fluoridpolyeder eingeschlossene Oktaeder und ist mit Ba3Al2F12 verwandt. Existenz und Struktur der A3M2F12-Verbindungen werden diskutiert.
    Notes: Pb3Al2F12 is a fluorometalate obtained in single-crystal form by hydrothermal synthesis. It crystallizes in the monoclinic system, space group P 21/n, with a = 9.435(6) Å, b = 9.610(5) Å, c = 10.100(9) Å, β = 90.59(5)°, V = 915.7(2) Å3, Z = 4. The structure was solved from single crystal using 3 044 unique reflections (MoKα, λ = 0.71073 Å), R = 0.0463, Rw = 0.0465. The structure exhibits isolated tetrameric groups of octahedra encaged in a subnetwork of independent fluoride polyhedra and is related to that of Ba3Al2F12. A discussion about the existence and the structure of A3M2F12 compounds is given.
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  • 109
    ISSN: 0044-2313
    Keywords: Rhenium complexes ; Nitrido compounds ; Mixed-ligand complexes ; X-ray crystal structure ; Ligand exchange ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed-Ligand Complexes of Rhenium IV. The Reaction of [ReNCl2(Me2PhP)3] with Dithiocarbamates. X-Ray Crystal Structures of trans-Chloro-dimethyldithiocarbamato-bis(dimethylphenylphosphine) nitridorhenium(V), [ReN(Cl)(Me2PhP)2(Me2dtc)], and Bis(diethyldithiocarbamato)(dimethylphenylphosphine)nitridorhenium(V), [ReN(Cl)(Me2PhP)(Et2dtc)2][ReNCl2(Me2PhP)3] reacts with dialkyldithiocarbamates, R2dtc-, under a stepwise ligand exchange. Final products of these reactions are the well-known [ReN(R2dtc)2] bischelates. Intermediatelly, however, complexes of the general formulae [ReN(Cl)(Me2PhP)2(R2dtc)] and [ReN(Me2PhP)(R2dtc)2] can be isolated. Representatives have been structurally characterized.[ReN(Cl)(Me2PhP)2(Me2dtc)] crystallizes monoclinic in the space group P21/c, Z = 4. The dimensions of the unit cell are a = 13.071(3); b = 11.622(1); c = 15.667(3) Å; β = 97.09(1)°. The rhenium atom has a distorted octahedral environment; the Re≡N bond length is 1.71(1) Å. The Re—Cl bond distance is markedly lengthened (2.665(2) Å) as a consequence of the strong trans labilizing influence of the coordinated nitrido ligand.[ReN(Me2PhP)(Et2dtc)2] crystallizes monoclinic in the space group P21/c, Z = 4, a = 17.262(3); b = 14.915(2); c = 9.888(2); β = 76.35(8)°. The equatorial coordination sphere is occupied by one phosphorus atom and three sulphur atoms. One of the dithiocarbamate ligands is coordinated bidentately; the second one with two distinct Re—S bond lengths. The Re—S(4) distance is 2.7983(2) Å which can be discussed as a weak interaction with the metal.
    Notes: Dichlorotris(dimethylphenylphosphan)nitridorhenium(V), [ReNCl2(Me2PhP)3], reagiert mit Dialkyldithiocarbamaten, R2dtc-, unter schrittweisem Ligandenaustausch. Als Endprodukte entstehen Komplexe der allgemeinen Formel [ReN(R2dtc)2]. Als Intermediate dieser Reaktion konnten Komplexe der Zusammensetzung [ReN(Cl)(Me2PhP)2(R2dtc)] und [ReN(Me2PhP)(R2dtc)2] isoliert und strukturell charakterisiert werden.[ReN(Cl)(Me2PhP)2(Me2dtc)] kristallisiert monoklin in der Raumgruppe P21/c, Z = 4. Die Elementarzelle hat die Abmessungen a = 13,071(3); b = 11,622(1); c = 15,667(3) Å; β = 97,09(1)°. Rhenium befindet sich in einer verzerrt oktaedrischen Koordinationsumgebung. Der Re≡N-Bindungsabstand beträgt 1,71(1) Å. Die trans-ständige Re—Cl-Bindung ist infolge des trans-Effektes des koordinierten Nitridoliganden stark aufgeweitet (2,665(2) Å).[ReN(Me2PhP)(Et2dtc)2] kristallisiert monoklin in der Raumgruppe P21/c, Z = 4, a = 17,262(3); b = 14,915(2); c = 9,888(2); β = 76,35(8)°. Die äquatoriale Koordinationssphäre ist mit einem Phosphor- und drei Schwefelatomen besetzt. Ein Dithiocarbamat-Ligand ist als „normales“ Chelat koordiniert; der andere ist mit zwei sehr unterschiedlichen Re—S-Abständen gebunden, wobei auch für das zweite Schwefelatom (Abstand Re—S(4): 2,7983(2) Å) Wechselwirkungen mit dem Metall diskutiert werden können.
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  • 110
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1455-1462 
    ISSN: 0044-2313
    Keywords: Zirconocene complexes ; vinylation reactions ; metallocycles ; butadiene complexes ; 91Zr n.m.r. spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vinylation and 91Zr N.M.R. Spectra of substituted Zirconocene DichloridesSubstituted zirconocene dichlorides react with vinyl lithium with formation of zirconacyclopent-2-enes, Cp2ZrCH = CHCH2CH2, or zirconocene butadiene complexes, Cp2Zr(C4H6). The compounds obtained were characterized by their 1H and 13C n.m.r. spectra.The 91Zr n.m.r. chemical shifts of substituted zirconocene dichlorides correlate with the bond angles Cp′—Zr—Cp′ and Cl—Zr—Cl respectively. They can be used to estimate the reaction behaviour of zirconocene dichlorides.
    Notes: Bei Reaktionen substituierter Zirconocendichloride, Cp2ZrCl2, mit Vinyllithium entstehen in Abhängigkeit von der Anzahl und der Raumerfüllung der Substituenten Zirconacyclopent-2-ene, Cp2H2, oder Zirconocen-butadien-Komplexe, Cp2Zr(C4H6). Diese Verbindungen wurden durch ihre 1H- und 13C-NMR-Spektren charakterisiert.Die Werte der 91Zr-NMR-chemischen Verschiebungen der substituierten Cp′2ZrCl2 stehen in Beziehung zu den jeweiligen Bindungswinkeln Cp′—Zr—Cp′ bzw. Cl—Zr—Cl und sind damit als empirische Parameter für die Abschätzung des Reaktionsverhaltens von Zirconocendichloriden geeignet.
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  • 111
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1463-1470 
    ISSN: 0044-2313
    Keywords: Chemical transport reaction ; MnMoO4 ; Mn2Mo3O8 ; phase diagrams ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemical Transport Reactions in the System Mn/Mo/OFor the ternary system Mn/Mo/O the phasepure preparation of the compounds MnMoO4 and Mn2Mo3O8 by chemical transport is reported. The deposition from a source of coexisting threephase mixtures give the possibility to prepare single crystals under defined oxygen partial pressure. The influence of different startmixtures and the agents Cl2, HCl, I2, HI, TeCl4 and SeCl4 on the transport behaviour are described. Results hitherto existing for the single crystals give hints of only very small homogeneity ranges for both phases.
    Notes: Für das ternäre System Mn/Mo/O wird über die phasenreine Darstellung der Verbindungen MnMoO4 und Mn2Mo3O8 durch chemischen Transport berichtet. Die Abscheidung aus koexistierenden Dreiphasengemischen ermöglicht die Darstellung von Einkristallen unter definiertem Sauerstoffpartialdruck. Der Einfluß der verschiedenen Bodenkörper und der Transportmittel Cl2, HCl, I2, HI, TeCl4 und SeCl4 auf das Transportverhalten wird beschrieben. Die bisherigen Untersuchungen an den erhaltenen Einkristallen lassen nur die Annahme eines sehr kleinen Homogenitätsgebietes für beide Phasen zu.
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  • 112
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1471-1475 
    ISSN: 0044-2313
    Keywords: Barium, mercury, platinum, oxide ; crystal structure ; high pressure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Contribution on Ba3Pt4HgO11: The First Alkaline-Earth Oxoplatinate(II,V)/OxomercurateSingle crystals of Ba3Pt4HgO11 were prepared by oxygen high pressure technique (4 200-3 600 bar) and investigated by X-ray methods. It crystallizes with hexagonal symmetry, space group D3h4—P62c, a = 6.021, c = 17.374 Å, Z = 2. Ba3Pt4HgO11 represents a new structure type, showing structural relationships to Ba2Hg3Pd7O14 and to the precious metal 6L-perovskites. The Hg2+ ions show dumb-bell like coordination, Pt2+ a square-planar surrounding and Pt5+ face shared double octahedra.
    Notes: Ba3Pt4HgO11 wurde unter hohem Sauerstoffdruck (4 200-3 600 bar) einkristallin dargestllt und röntgenographisch untersucht. Die Verbindung kristallisiert hexagonal, Raumgruppe D3h4—P62c mit a = 6,021; c = 17,374 Å; Z = 2. Ba3Pt4HgO11 bildet einen neuen Strukturtyp, der kristallchemische Verwandtschaft zu Ba2Hg3Pd7O14 und den Edelmetall-6L-Perowskiten zeigt. Die Hg2+-Ionen weisen eine hantelförmige, Pt2+ eine quadratisch-planare Koordination auf. Pt5+ bildet mit O2- flächenverknüpfte Doppeloktaeder.
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  • 113
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1692-1697 
    ISSN: 0044-2313
    Keywords: Sodium copper scandium fluoride ; sodium zinc aluminium fluoride ; weberite structure ; crystal structure determination ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structures of the Weberites Na2CuScF7 and Na2ZnAlF7At single crystals of the orthorhombic weberites Na2CuScF7 (Pmnb, Z = 4) and Na2ZnAlF7 (Imma, Z = 4) X-ray structure determinations were performed. Na2CuScF7 (Na2ZnAlF7): a = 726.0 (709.2), b = 1053.4 (1009.2), c = 765.8 (733.7) pm; R1 = 0.030 (0.042) for 887 (363) observed and independent reflections. The resulting average distances of the octahedrally coordinated metal atoms are: Cu—F = 200.7 pm, Sc—F = 201.7 pm; Zn—F = 198.8 pm, Al—F = 180.1 pm. Some structural relations and the variation in the bridge angles of the corner-sharing octahedra are discussed.
    Notes: An Einkristallen der orthorhombischen Weberite Na2CuScF7 (Pmnb, Z = 4) und Na2ZnAlF7 (Imma, Z = 4) wurden röntgenographische Strukturbestimmungen durchgeführt. Na2CuScF7 (Na2ZnAlF7): a = 726,0 (709,2), b = 1053,4 (1009,2), c = 765,8 (733,7) pm; R1 = 0,030 (0,042) für 887 (363) beobachtete und unabhängige Reflexe. Die resultierenden mittleren Abstände für die oktaedrisch koordinierten Metallatome sind: Cu—F = 200,7 pm, Sc—F = 201,7 pm; Zn—F = 198,8 pm, Al—F = 180,1 pm. Die Stukturverhältnisse und die Unterschiede in den Brückenwinkeln der eckenverknüpften Oktaeder werden diskutiert.
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  • 114
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    Zeitschrift für anorganische Chemie 620 (1994), S. 944-946 
    ISSN: 0044-2313
    Keywords: Long-chain diphenylphospine-modifed hectorite ; coordinative anchoring of nickel chloride ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Coordinative Anchoring of Nickel Complexes on Hectorite-Layer Silicates through long-chain Diphenylphosphine GroupsThe treatment of sodium and calcium hectorites with 2-diphenylphosphinoethyltriethoxysilane leads, by condensation of free hydroxyl groups, to functionalized layer silicates with long-chain diphenylphosphine groups onto which nickel chloride can be coordinated. In these modified hectorites the fourth coordination site of the tetrahedrally coordinated nickel is occupied by a labile solvent molecule. On the other hand, the complex bis(2-diphenylphosphinoethyltriethoxysilane)nickel(II) chloride prepared beforehand also reacts with sodium hectorite under condensation; but the square-planar coordination of the four stable ligands (two chloride and two phosphor atoms) is maintained. This finds its expression in a significant activity decrease in catalytic reactions as compared to the aforementioned products.
    Notes: Die Umsetzung von Natrium- und Calcium-Hectoriten mit 2-Diphenylphosphinoethyltriethoxysilan führt durch Kondensation an den freien Hydroxylgruppen zu funktionalisierten Schichtsilicaten mit langkettigen Diphenylphosphinogruppen, an denen sich Nickelchlorid koordinieren läßt. In diesen modifizierten Hectoriten ist die vierte Koordinationsstelle des tetraedrisch koordinierten Nickels von einem labil gebundenen Lösungsmittelmolekül besetzt. Andererseits läßt sich auch der vorgefertigte Komplex Bis(2-diphenylphosphinoethyltriethoxysilan)nickel(II)-chlorid an Natrium-Hectorit ankondensieren; dabei bleibt die planar-quadratische Koordination der vier stabilen Liganden (zwei Chlor- und zwei Phosphoratome) am Nickel erhalten. Dies kommt gegenüber den erstgenannten Produkten in einem deutlichen Aktivitätsabfall bei katalytischen Reaktionen zum Ausdruck.
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  • 115
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    Zeitschrift für anorganische Chemie 620 (1994), S. 950-954 
    ISSN: 0044-2313
    Keywords: Tetrabromobispyridinemolybdates ; preparation ; isomerisation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung von cis-tetrabromobispyridinemolybdaten(III) und die Kristallstruktur von cis-(NH4)[MoBr4py2] · ⅓ H2O (py = Pyridin)(NH4)2[MoBr5 · H2O] reagiert mit Pyridin im Acetonitril (CH3CN) bei Zimmertemperatur. Das Produkt ist ein Gemenge von cis- und trans-(pyH)[MoBr4py2], das auf Grund der Löslichkeitsunterschiede aufgetrennt werden kann. cis-M[MoBr4py2] · ⅓ H2O (M = NH4+, Rb+, Cs+), cis-(bipyH)[MoBr4py2] (bipy = 2,2′-Bipyridyl) und cis-(PPh4)[MoBr4py2] wurden aus cis-(pyH)[MoBr4py2] dargestellt.In siedendem Acetonitril (82°C) erfolgt irreversible cis-trans-Isomerisierung. Brom oxidiert das cis-Diastereoisomere zu trans-MoBr4py2.Die Verbindungen wurden durch chemische Analyse, Infrarot-, UV-VIS-Spektroskopie, Konduktometrie und Röntgen-Pulveraufnahmen charakterisiert.Die Kristallstruktur von cis-(NH4)[MoBr4py2] · ⅓ H2O wurde bestimmt: rhomboedrisch, R3c, (No. 161), a = 15,809(3) Å, β = 112,79(2)°, Z = 6, Dröntg. = 2,29, Dgemess. = 2,27(3) g/cm3, V = 2 601(1) Å3, R1 = 0,046, Rw = 0,068. Die mittleren Mo—Br und Mo—N(Pyridin)-Abstände sind 2,58(2) bzw. 2,20(2) Å. cis-Rb[MoBr4py2] · ⅓ H2O und cis-Cs[MoBr4py2] · ⅓ H2O sind isostrukturell mit cis-(NH4)[MoBr4py2] · ⅓ H2O.
    Notes: The reaction between (NH4)[MoBr5 · H2O] and pyridine in acetonitrile (CH3CN) at room temperature results in the mixture of cis- and trans-(pyH)[MoBr4py2] which can be separated on the basis of solubility. cis-M[MoBr4py2] · ⅓ H2O (M = NH4+, Rb+, Cs+), cis-(bipyH)[MoBr4py2] (bipy = 2,2′-bipyridil) and cis-(PPh4)[MoBr4py2], were prepared from cis-(pyH)[MoBr4py2].At the temperature of boiling acetonitrile irreversible cis to trans isomerisation takes place. Bromine oxydizes cis isomers at room temperature to trans-MoBr4py2.The compounds were characterised by chemical analysis, infrared, UV-VIS spectroscopy, conductivity measurements and powder diffraction.The crystal structure of cis-(NH4)[MoBr4py2] · ⅓ H2O has been determined: rhombohedral, R3c, (No. 161), a = 15.809(3) Å, β = 112.79(2)°, Z = 6, DC = 2.29, DO = 2.27(3) g/cm3, V = 2 601(1) Å3, R1 = 0.046, Rw = 0.068. Average Mo—Br and Mo—N(pyridine) distances within the anion are 2.58(2) and 2.20(2) Å. cis-Rb[MoBr4py2] · ⅓ H2O and cis-Cs[MoBr4py2] · ⅓ H2O are isostructural with cis-(NH4)[MoBr4py2] · ⅓ H2O.
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1678-1685 
    ISSN: 0044-2313
    Keywords: Ditelluride ; [(2,4,6-Ph3C6H2)Te]2 ; Bis(triphenylphosphanegold(I))tellurolate ; [(2,4,6-Ph3C6H2)Te(AuPPh3)2]PF6 ; Diiodinegold(III) tellurolate ; [(2,4,6-Ph3C6H2)TeAuI2]2 ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of [(Ph3C6H2)Te]2, [(Ph3C6H2)Te(AuPPh3)2]PF6 and [(Ph3C6H2)TeAuI2]2[(2,4,6-Ph3C6H2)Te]2 reacts with Ph3PAu+ to yield [2,4,6-Ph3C6H2TeAuPPh32]PF6 which can be oxidized by I2 to form the gold(III) complex [(2,4,6-Ph3C6H2)TeAuI2]2. [(2,4,6-Ph3C6H2)Te]2 crystallizes in the monoclinic space group P21/c with a = 810.6(2); b = 2026.5(5); c = 2260.6(7) pm; β = 99.23(3)° and Z = 4. In the crystal structure the ditelluride exhibits a dihedral angle C11—Te1—Te2—C21 of 66.1(2)°. The distance Te1—Te2 is 269.45(6) pm. In the cation of the triclinic complex [(2,4,6-Ph3C6H2)Te(AuPPh3)2]PF6 (space group P1; a = 1197.4(3); b = 1457.2(4); c = 1680.0(6) pm; α = 84.69(3)°; β = 85.11(3)°; γ = 75.54(3)°; Z = 2) a pyramidal skeleton RTeAu2 with distances Te—Au = 259.2(1) and 257.8(2) pm and Au—Au = 295.3(1) pm is present. [(2,4,6-Ph3C6H2)TeAuI2]2 crystallizes in the triclinic space group P1 with a = 1086.3(3); b = 1462.9(6); c = 1654.2(2) pm; α = 85.25(2)°; β = 87.44(1)°; γ = 80.90(3)°; Z = 2. In the centrosymmetrical dinuclear complex [(2,4,6-Ph3C6H2)TeAuI2]2 the Au atoms exhibit a square-planar coordination by two iodine atoms and two tellurolate ligands. The tellurolate ligands form symmetrical bridges with distances Te—Au = 260.0 pm. The distances Au—I are in the range of 260.3(1) and 263.7(1) pm.
    Notes: [(2,4,6-Ph3C6H2)Te]2 reagiert mit Ph3PAu+ unter Bildung von [2,4,6-Ph3C6H2)Te(AuPPh3)2]+, das von I2 zu der Gold(III)-Verbindung [(2,4,6-Ph3C6H2)TeAuI2]2 oxidiert werden kann. [(2,4,6-Ph3C6H2)Te]2 kristallisiert monoklin in der Raumgruppe P21/c mit a = 810,6(2); b = 2026,5(5); c = 2260,6(7) pm; β = 99,23(3)° und Z = 4. In der Kristallstruktur bildet das Ditellurid einen Diederwinkel C11—Te1—Te2—C21 von 66,1(2)°. Der Abstand Te1—Te2 beträgt 269,45(6) pm. Im Kation der triklinen Verbindung [(2,4,6-Ph3C6H2)Te(AuPPh3)2]PF6 (Raumgruppe P1; a = 1197,4(3); b = 1457,2(4); c = 1680,0(6) pm; α = 84,69(3)°; β = 85,11(3)°; γ = 75,54(3)°; Z = (2) liegt ein pyramidales RTeAu2-Gerüst mit Abständen Te—Au = 259,2(1) und 257,8(2) pm und Au—Au = 295,3(1) pm vor. [(2,4,6-Ph3C6H2)TeAuI2]2 kristallisiert in der triklinen Raumgruppe P1 mit a = 1086,3(3); b = 1462,9(6); c = 1654,2(2) pm; α = 85,25(2)°; β = 87,44(1)°; γ = 80,90(3)°; Z = 2. Im zentrosymmetrischen Zweikernkomplex [(2,4,6-Ph3C6H2)TeAuI2]2 sind die Au-Atome quadratisch planar von zwei Iod-und zwei Tellurolatoliganden koordiniert. Die Tellurolatoliganden bilden symmetrische Brücken mit Au—Te-Abständen von 260,0 pm. Die Au—I-Abstände liegen zwischen 260,3(1) und 263,7(1) pm.
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1698-1701 
    ISSN: 0044-2313
    Keywords: Ternary selenides of lanthanides ; preparation ; crystal structure ; electronic structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Ternary Selenides of Lanthanoides by Reduction of SesquiselenidesThe compounds MLn2Se3 (M = Na; Ln = La—Sm) and MLn8Se12 (M = Na, Ca; Ln = La—Sm) were prepared by reduction of the corresponding lanthanide sesquiselenides with sodium and calcium, respectively, for the first time. Further-more MLa8Se12 (M = Sr, Eu) could be obtained in an analogous way. All compounds were characterized by chemical analysis and X-ray powder diffraction. The electronic structures of these compounds were investigated by band structure calculations and magnetic measurements.
    Notes: Die Verbindungen MLn2Se3 (M = Na, Ln = La—Sm) und MLn8Se12 (M = Na, Ca; Ln = La—Sm) wurden durch Reduktion der entsprechenden Lanthanidsesquiselenide mit Natrium bzw. Calcium erstmals dargestellt. Weitere Selenide MLa8Se12 (M = Sr, Eu) konnten analog erhalten werden. Die dargestellten Verbindungen wurden analytisch und röntgenographisch charakterisiert. Zur Bestimmung der elektronischen Struktur dieser Verbindungen wurden Bandstrukturrechnungen und magnetische Messungen durchgeführt.
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1702-1706 
    ISSN: 0044-2313
    Keywords: Potassium monomethylcarbonate ; Synthesis ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of Potassium MonomethylcarbonatePotassium monomethylcarbonate KCH3CO3 was obtained from reaction of dimethylcarbonate with potassium hydroxide in methanole. The crystal structure was determined (triclinic, P1 (no. 2), Z = 2, a = 380.9(2) pm, b = 558.9(3) pm, c = 985.3(3) pm, α = 100.71(2)°, β = 90.06(3)°, γ = 92.48(3)°, V = 205.9(2) · 106 pm3, wR(F2) = 0.054, wRobs(F) = 0.022). Structural relations between potassium monomethylcarbonate and potassium hydrogencarbonate are discussed.
    Notes: Kaliummonomethylcarbonat KCH3CO3 wurde durch Umsetzung von Dimethylcarbonat mit Kalium-hydroxid in Methanol dargestellt. Die Kristallstruktur wurde aufgeklärt (triklin, P1 (Nr. 2), Z = 2, a = 380,9(2) pm, b = 558,9(3) pm, c = 985,3(3)pm, α = 100,71(2)°, β = 90,06(3)°, γ = 92,48(3)°, V = 205,9(2) · 106 pm3, wR(F2) = 0,054, wRobs(F) = 0,022). Strukturbeziehungen zum Kaliumhydrogencarbonat werden diskutiert.
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1714-1718 
    ISSN: 0044-2313
    Keywords: Alkinyl thiophosphinous acid ester ; alkinyl [1,3,2]dithiaphospholane ; [1,4]dithiane ; nmr, mass, i.r. spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phenylethinyl-[1,3,2]dithiaphospholane. Bis(dithiaphospholanyl)-[1,4]dithianeNucleophilic substitution of the amino group but no cycloaddition occurs in the reaction of phenyl phenylethinyl phosphinous acid diethylamide, 5, with 2-aminothiophenol forming compound 6. By analogous reaction, phenylethinyl phosphonic bis(diethylamide), 7, and ethane-1,2-dithiol form compound 8. Cycloaddition besides nucleophilic substitution is observed, however, when acetylene bis(phosphonic diethyl-amide), 9, and ethane-1,2-dithiol are reacted resulting in compound 11. All new products are characterized by their nmr, mass, and i.r. spectra. Furthermore, the results of an X-ray structure analysis of 11 are reported.
    Notes: Bei der Reaktion von Phenyl-phenylethinyl-phosphinigsäure-diethylamid, 5, mit 2-Aminothiophenol findet keine Cycloaddition statt sondern eine nukleophile Substitution der Aminogruppe, die zu Verbindung 6 führt. Analog reagiert Phenylethinyl-phosphonigsäure-bis(diethylamid), 7, mit Ethan-1,2-dithiol zu Verbindung 8. Cycloaddition und nukleophile Substitution werden jedoch bei der Umsetzung von Acetylen-bis(phosphonigsäurediethylamid), 9, und Ethan-1,2-dithiol beobachtet; es entsteht Verbindung 11. Alle neuen Reaktions-produkte sind durch ihre NMR-, Massen- und IR-Spektren charakterisiert. Von 11 wird eine Kristallstrukturanalyse mitgeteilt.
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1707-1713 
    ISSN: 0044-2313
    Keywords: Thallium-μ-carbonato-μ-hydroxo-copper(II) ; synthesis ; crystal structure ; thermal decomposition ; IR-spectroscopy ; magnetic properties ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: TlCu(OH)CO3  -  a New Basic Thallium Copper CarbonateTlCu(OH)CO3 was prepared from carbonate solutions. Its crystal structure was determined (hexagonal, P63/m (Nr. 176), a = 1084.9(1), b = 611.8(1) pm, VEZ = 623.6(1) X 106 pm3, Z = 6, R = 0.036, Rw = 0.020). Structural features are Cu—O chains bridged by carbonate groups and tunnels parallel [0 0 1]. The thermal behaviour of the new carbonat was examined with TG/DTA- and Simon-Guinier-techniques. The decomposition occurs in two steps to the products Tl2O and CuO. Magnetic measurements show Curie-paramagnetism with θCurie = 2.7 K. A ferromagnetic arrangement of the Cu2+-moments was detected below 4.8 K. An IR-spectrometric characterisation in comparision with other copper-carbonato complexes will be discussed.
    Notes: TlCu(OH)CO3 wurde aus wäßrigen Carbonatlösungen dargestellt. Es kristallisiert hexagonal, in der RG P63/m (Nr. 176), mit a = 1084,(1), b = 611,8(1) pm, VEZ = 623,6(1) · 106 pm3, Z = 6, R = 0,036, Rw = 0,020. Struktur-bestimmende Merkmale sind über Carbonatgruppen verbrückte Cu—O-Ketten und parallel [0 0 1] verlaufende kanalartige Hohlräume. Das thermische Verhalten wurde mittels TG/DTA-Untersuchungen und Simon-Guinier-Aufnahmen untersucht. Die Zersetzung erfolgt in zwei Schritten zu Tl2O und CuO als Endprodukte. Magnetische Messungen ergeben einen reinen Curie-Paramagnetismus mit θCurie = 2,7 K. Unterhalb 4,8 K wird eine ferromagnetische Ordnung der Cu2+ -Momente festgestellt. Das IR-Spektrum wird im Vergleich mit Spektren anderer Kupfer(II)-carbonato-Komplexe diskutiert.
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1725-1729 
    ISSN: 0044-2313
    Keywords: Methylene phosphanes ; x-ray analysis ; iron complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Reactivity of (η5-C5Me5)(CO)2FeP(SiMe3)2 Toward P-Chloromethylene phosphanesThe reaction of (η5-C5Me5)(CO)2FeP(SiMe3)2 (2) with three equivalents of Cl—P=C(SiMe3)2 (3a) afforded the 3-methanediyl-1,3,5,6-tetraphosphabicyclo[3.1.0]hex-2-ene (η5-C5Me5)(CO)2Fe— (6a). In contrast, 2 reacts with two equivalents of Cl—P=C(Ph)SiMe3 (3b) to give the thermolabile (η5-C5Me5) · (CO)2Fe—P[P=C(Ph)SiMe3]2 (4b) which decomposed during the reaction with further 3b. 4 b was also obtained from (η5-C5Me5)(CO)2Fe—P(SiMe3)—P=C(SiMe3)2 (1a) and two equivalents of 3b.
    Notes: Die Reaktion von (η5-C5Me5)(CO)2FeP(SiMe3)2 (2) mit drei Äquivalenten des P-Chlorphosphaalkens Cl—P = C(SiMe3)2 (3a) lieferte das 3-Methandiyl-1,3,5,6-tetra-phosphabicyclo[3.1.0]hex-2-en (η5-C5Me5)(CO)2Fe— (6a). Demgegenüber reagiert 2 mit zwei Äquivalenten an Cl—P=C(Ph)SiMe3 (3b) zu der thermolabilen Verbindung (η5-C5Me5)(CO)2Fe—P[P=C(Ph)SiMe3]2 (4b), die sich bei der Behandlung mit überschüssigen 3b zersetzt. 4b wird auch bei der Umsetzung von (η5-C5Me5)(CO)2FeP(SiMe3)—P=C(SiMe3)2 (1a) mit zwei Äquivalenten 3b erhalten.
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  • 122
    ISSN: 0044-2313
    Keywords: Silanolato Complexes of Titanium and Zirconium ; Synthesis ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Silanolato Complexes of Titanium and Zirconium. The Crystal Structures of Cp2TiCl(OSiPh3) and Cp2ZrCl(OSiPh3)The title compounds have been prepared by the reaction of Cp2MCl2 (M = Ti, Zr) with triphenylsilanole in diethylether in the presence of piperidine. They form only sparingly moisture sensitive orange (Ti) or colourless (Zr) crystal needles, which were characterized by X-ray crystallography.Cp2TiCl(OSiPh3): Space group P21/n, Z = 4, structure solution with 3961 observed unique reflections, R = 0.057. Lattice dimensions at 20°C: a = 1029.6, b = 1719.3, c = 1388.9 pm, β = 100.69°. The compound forms monomeric molecules with bond lengths TiO of 184.2 pm, SiO of 161.5 pm, and a TiOSi bonding angle of 164.5°.Cp2ZrCl(OSiPh3): Space group P3, Z = 18, structure solution with 2799 observed unique reflections, R = 0.047. Lattice dimensions at -20°C: a = b = 3518, c = 1058.3 pm. The structure consists of three symmetry-independent monomeric molecules, which differ only slightly. The bond lengths are (in average): ZrO 196.4 pm, SiO 162.1 pm, the ZrOSi bond angle is 173.7°.
    Notes: Die Titelverbindungen werden aus Cp2MCl2 (M = Ti, Zr) und Triphenylsilanol in Diethylether in Gegenwart von Piperidin hergestellt. Sie bilden nur wenig feuchtigkeits-empfindliche orange (Ti) bzw. farblose Kristallnadeln (Zr), die wir kristallographisch charakterisiert haben.Cp2TiCl(OSiPh3): Raumgruppe P21/n, Z = 4, Strukturlösung mit 3961 unabhängigen, beobachteten Reflexen, R = 0,057. Gitterkonstanten bei -50°C: a = 1029,6; b = 1719,3; c = 1388,9 pm, β = 100,69°. Die Verbindung bildet monomere Moleküle mit Abständen TiO von 184,2 pm, SiO von 161,5 pm und einem TiOSi-Bindungswinkel von 164,5°.Cp2ZrCl(OSiPh3): Raumgruppe P3, Z = 18, Strukturlösung mit 2799 unabhängigen, beobachteten Reflexen, R = 0,047. Gitterkonstanten bei -20°C: a = b = 3518; c = 1058,3 pm. Die Struktur enthält drei symmetrieunabhängige monomere Moleküle, die sich nur wenig voneinander unterscheiden. Die Abstände ZrO betragen im Mittel 196,4 pm, SiO im Mittel 162,1 pm und die Bindungswinkel ZrOSi im Mittel 173,7°.
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  • 123
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1736-1740 
    ISSN: 0044-2313
    Keywords: Sodium amalgam, Na3Hg ; α - β phase change ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Temperature Dependent Single Crystal Investigations of α-Na3HgIn contrast to β-Na3Hg (rhomboedrally distorted Li3Bi-type) α-Na3Hg crystallizes in a hitherto poorly understood variant of the Na3As-type. Based on temperature dependent measurements of poly- and single crystalline samples (-100°C 〈 T 〈 +35°C) we show, that in particular the sodium atoms (Na1) located in the region of the octahedral Hg6-holes show a pronounced temperature dependent dynamical behaviour. To a lesser extend this is also true for the tetrahedrally coordinated Na-atoms (Na2). With increasing temperature the former ones more and more approach the centers of the opposite triangular faces of mercury atoms, limiting the Hg6-octahedra along [001]. Occupation of the latter positions by sodium atoms would lead to unusual short interatomic distances dNa—Hg. However before reaching this unreasonable situation α-Na3Hg decomposes under formation of β-Na3Hg.
    Notes: Im Unterschied zu β-Na3Hg (rhomboedr. verzerrter Li3Bi-Typ) kristallisiert α-Na3Hg in einer bislang unverstandenen Variante des hexagonalen Na3As-Typs (Tu(α β) = + 36°C). Ausgehend von temperaturabhängigen Messungen an mikro- und einkristallinen Proben (-100°C 〈 T 〈 +35°C) können wir klar zeigen, daß insbesondere die Na-Atome (Na1) im „Einzugsbereich“ der Hg6-Oktaederlücken eine ausgeprägte, temperaturabhängige Dynamik zeigen. Dies gilt in geringem Maße auch für die tetraedrisch durch Hg koordinierten Na-Atome (Na2). Erstere entfernen sich mit zunehmender Temperatur von den Oktaederzentren und „tauchen“ mehr und mehr in die längs [001] gegenüberliegenden, die Hg6-Oktaeder begrenzenden Dreiecksflächen ein. Vor Erreichen des Mittelpunktes der Dreiecksflächen, einer Atomposition, die zwar dem idealen Na3As-Typ entspricht, deren Besetzung aber im vorliegenden Fall zu unakzeptabel kurzen interatomaren Abständen dNa—Hg führen würde, findet jedoch die Phasenumwandlung α-→β-Na3Hg statt.
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  • 124
    ISSN: 0044-2313
    Keywords: Metallophosphaalkenes ; hexafluoracetone ; metallodisilyl phosphanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal-substituted Acylphosphanes and Phosphaalkenes. 22. Insertions of Hexafluoroacetone into the PX-Bond of Metallophosphanes (η5-C5Me5)(CO)2M—PX2 (M = Fe, Ru; X = Me3Si, Cl). Structure Determination of (η5-C5Me5)(CO)2Fe—P(SiMe3)C(CF3)2(OSiMe3)Reaction of the metallophosphanes (η5-C5Me5)(CO)2M—P(SiMe3)2 (1a: M = Fe; 1b: M = Ru) with hexafluoroacetone (HFA) afforded the complexes (η5-C5Me5)(CO)2M—P(SiMe3)C(CF3)2(OSiMe3) (2a, b). The attempted synthesis of a metallophosphaalkene from 2a by thermal elimination of hexamethyldisiloxane failed. The acid catalyzed hydrolysis of 2a afforded compound (η5-C5Me5) · (CO)2Fe—P(H)C(CF3)2(OSiMe3) (3).Hexafluoracetone and (η5-C5Me5)(CO)2Fe—PCl2 (4) under-went reaction to give the metallochlorophosphan (η5-C5Me5) · (CO)2Fe—P(Cl)—O—C(CF3)2Cl (5). Constitutions and configurations of the compounds (2-5) were established by elemental analyses and spectroscopic data (IR, 1H-, 13C, 19F-, 29Si-, 31P-NMR, MS). The molecular structure of 2a was determined by x-ray diffraction analysis.
    Notes: Die Reaktion der Metallophosphane (η5-C5Me5)(CO)2M—P(SiMe3)2 (1a: M = Fe; 1b: M = Ru) mit Hexafluoraceton (HFA) liefert die Komplexe (η5-C5Me5) · (CO)2M—P(SiMe3)C(CF3)2(OSiMe3) (2a, b) Eliminierungsversuche von Hexamethyldisiloxan unter Ausbildung eines Metallophosphaalkens scheiterten. Bei der säurekatalysierten Hydrolyse von 2a entsteht die Verbindung (η5-C5Me5)(CO)2Fe—P(H)C(CF3)2(OSiMe3) (3). Hexafluoraceton und (η5-C5Me5)(CO)2Fe—PCl2 (4) reagieren zum Metallophosphan (η5-C5Me5)(CO)2Fe—P(Cl)—O—C(CF3)2Cl (5). Konstitution und Konfiguration der Verbindungen (2-5) wurden durch Elementaranalysen und spektroskopische Daten (IR, 1H-, 13C, 19F-, 29Si-, 31P-NMR sowie MS) ermittelt. Von 2a wurde zudem eine Einkristall-Röntgenstrukturanalyse durchgeführt.
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  • 125
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1750-1754 
    ISSN: 0044-2313
    Keywords: Cobalt Complexes ; Pyrazine ; Gel Crystallization ; Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Growth and Structure of CoSO4 · Pyrazine · 6 H2O (I) and (CoSO4)2 · Pyrazine · 12 H2O (II)Single crystals of μ-pyrazino-bis[pentaquacobalt(II)]-sulfate-dihydrate CoSO4(pz) · 6 H2O and Tetraqua-μ-pyrazino-cobalt(II)sulfate-dihydrate (CoSO4)2(pz) · 12 H2O were grown by using gel methods and investigated by X-ray analysis. CoSO4(pz) · 6 H2O (I) shows monoclinic symmetry, space group C2/c; a = 1006.4(4) pm, b = 1026.9(4) pm, c = 1261.5(2) pm; β = 104.01(4)°; Z = 4. (CoSO4)2(pz) · 12 H2O (II) shows orthorhombic symmetry, space group Pbam; a = 1262.3(4) pm, b = 1231.3(4) pm, c = 684.1(2) pm; Z = 2. CoSO4 and Pyrazine crystallize in a polymeric (I) as well as in a dimeric (II) compound. In the polymeric compound the molecules are bonded by pyrazine to form alternating linear chains. The dimer is a dinuclear complex with a bridging pyrazine molecule.
    Notes: μ-Pyrazino-bis[pentaquacobalt(II)]sulfatdihydrat (CoSO4 · Pyrazin · 6 H2O) und Tetraqua-μ-pyrazino-cobalt(II)sulfat-dihydrat ((CoSO4)2 · Pyrazin · 12 H2O) wurden mittels der Gelmethode synthetisiert und röntgenographisch untersucht. CoSO4 · Pz · 6 H2O (I) kristallisiert monoklin, Raumgruppe C2/c, a = 1006,4(4) pm, b = 1026,9(4) pm, c = 1261,5(2) pm; β = 104,01(4)°; Z = 4. (CoSO4)2 · Pz · 12 H2O (II) kristallisiert orthorhombisch, Raumgruppe Pbam, a = 1262,3(4) pm, b = 1231,3(4) pm, c = 684,1(2) pm; Z = 2. Zwischen CoSO4 und Pyrazin läßt sich neben einer polymeren (I) auch eine dimere Verbindung (II) kristallisieren. Der polymeren Verbindung liegen lineare, in ihrer Richtung alternierende Ketten zugrunde. Das Dimere liegt als pyrazinverbrückter Zweikernkomplex vor.
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  • 126
    ISSN: 0044-2313
    Keywords: SnCl2 bridging ligand ; pentacarbonylmetal derivatives ; organometallic protection ; Sn—O-cage compound ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: SnCl2 as a Bridging Ligand in [{(CO)5M}2Sn(Cl)2]2- (M = Cr, Mo, W)  -  Synthesis, Structure, and Reactivity[{(CO)5Cr}2Sn(Cl)2]2-, 1, may be obtained from [(CO)5Cr]2- or [(CO)5CrSnCl2 · THF] in fair yields. Alternatively, 1 is accessible by the reaction of [Cr2(CO)10]2- with SnCl2. This procedure may be extended to the synthesis of [{(CO)5M}2Sn(Cl)2]2- (M = Mo, 2; M = W, 3). The compounds 1-3 are crystallized as their alkalimetal (12-crown-4)2 or [2,2,2]cryptand salts. X-ray analyses demonstrate bridging SnCl2-moieties with M—Sn—M-angles close to 130° in each case. The relation of the bonding situation in 1-3 to the ones observed for stannylene or „inidene“ complexes, respectively, is discussed. The transformation of 1 into the rhombododecahedral (X-ray analysis) Sn—O-cage compound [{(CO)5CrSn}6(μ3-O)4(μ3-OH)4], 4, demonstrates the reactivity of the dianions 1-3.
    Notes: [{(CO)5Cr}2Sn(Cl)2]2, 1, kann aus [(CO)5Cr]2- oder [(CO)5CrSnCl2 · THF] in guten Ausbeuten dargestellt werden. Alternativ ist 1 aus [Cr2(CO)10]2- und SnCl2 zugänglich. Dieses Verfahren kann auf die Synthese von [{(CO)5M}2Sn(Cl)2]2- (M = Mo, 2; M = W, 3) übertragen werden. Die Dianionen 1-3 werden als Alkalimetall-(12-Krone-4)2 oder -[2,2,2]Kryptand-Salze kristallisiert. Einkristallröntgenstrukturanalysen zeigen jeweils die Verbrückung durch die SnCl2-Einheit mit M—Sn—M-Winkeln nahe bei 130°. Die Beziehung der Bindungsverhältnisse in 1-3 zu denen, die in Stannylen- oder „Iniden“-Komplexen beobachtet werden, wird diskutiert.Die Umwandlung von 1 in die rhombendo-dekaedrische (Röntgenstrukturanalyse) Käfigverbindung [{(CO)5CrSn}6(μ3-O)4(μ3-OH)4], 4, belegt die Reaktivität der Dianionen 1-3.
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  • 127
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1755-1759 
    ISSN: 0044-2313
    Keywords: Chemical Transport ; Crystal Structure ; Germanium-diphosphate, GeP2O7 ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions on the Thermal Behaviour and Crystal Chemistry of Anhydrous Phosphates. XI. Synthesis and Crystal Structure of a Triclinic Modification of GeP2O7A new triclinic modification of GeP2O7 can be obtained by hydrolysis of GeCl4 in conc. H3PO4 as a microcrystalline powder. Chemical transport experiments (950 → 850°C, transport agent: Cl2; p = 0.1 atm (298 K)) lead to the formation of small prisms (edge lengths up to 0.7 mm) of high refractive index at the lower temperature zone. The crystal structure determination [Spcgrp.: P1; Z = 2; a = 7.730(1) Å; b = 6.724(1) Å; c = 4.6543(8) Å; α = 105.39(1)°; β = 92.81(1)°; γ = 91.49(1)°; 1 358 independent I0; 94 parameters; conventional residual R1 = 3.1%] shows CN = 6 for Ge (regular octahedra: d̄Ge1—O = 1.86 Å; d̄Ge2—O = 1.85 Å) and P2O7-groups (d̄P1—O = 1.53 Å; d̄P2—O = 1.53 Å) with ∠ (P—O—P) = 126.5°. All O exhibit twofold coordination which is achieved either by two P or by one Ge- and one P. This modification of GeP2O7 bears a close relationship to the crystal structure of PtP2O7 and to the [MoP2O7]-host lattice of Na0.3MoP2O7. Remarkable differences to the well known cubic structures of many other metal(IV)-diphosphates occur.
    Notes: Durch Hydrolyse von GeCl4 in konz. H3PO4 entstand eine neue Modifikation von GeP2O7 als mikrokristallines Pulver, das durch chemischen Transport (950 → 850°C, Transportmittel: Cl2; p = 0,1 atm (298 K) in Form stark lichtbrechender Prismen mit Kantenlängen bis zu 0,7 mm kristallisiert wurde. Die Kristallstrukturbestimmung [Raumgr.: P1; Z = 2; a = 7,730(1) Å; b = 6,724(1) Å; c = 4,6543(8) Å; α = 105,39(1)°; β = 92,81(1)°; γ = 91,49(1)°; 1 358 symmetrie-unabhängige I0; 94 Parameter; konventioneller Gütefaktor R1 = 3,1%] zeigt CN = 6 für Ge (regelmäßiges Oktaeder: d̄Ge1—O = 1,86 Å; d̄Ge2—O = 1,85 Å) und P2O7-Gruppen (d̄P1—O = 1,53 Å; d̄P2—O = 1,53 Å) mit ∠ (P—O—P) = 126,5°. Jedes O ist zweifach mit P oder mit einem P und einem Ge koordiniert. Diese Modifikation von GeP2O7 zeigt enge Verwandtschaft zur Kristallstruktur von PtP2O7 und zum [MoP2O7]-Wirtsgitter von Na0,3MoP2O7, unterscheidet sich aber deutlich von den kubischen Strukturen zahlreicher anderer Metall(IV)-diphosphate.
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  • 128
    ISSN: 0044-2313
    Keywords: Phosphoraneiminato ; Complexes of Titanium ; Synthesis ; IR Spectra ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphoraneiminato Complexes of Titanium. Synthesis and Crystal Structures of CpTiCl2(NPMe3), [TiCl3(NPMe3)]2, [Ti2Cl5(NPMe2Ph)3], and [Ti3Cl6(NPMe3)5][BPh4]The title compounds are formed from Cp2TiCl2 and titanium tetrachloride, respectively, and the corresponding phosphane imino compounds Me3SiNPMe3 and Me3SiNPMe2Ph. The tetraphenyl borate salt yielded from the reaction of [Ti3Cl6(NPMe3)5]Cl with NaBPh4. All compounds form yellow crystals which are sensitive to moisture. They were characterized by IR-spectroscopy and crystal structure analyses.CpTiCl2(NPMe3) (1): Space group Pbca, Z = 8, solution of the structure with 1632 observed independent reflections, R = 0.037. Lattice dimensions at 19°C: a = 1202.6, b = 1224.2, c = 1766.7 pm. The molecules of the compound are monomeric with the (NPMe3)- ligand in almost linear array (bond angle Ti—N—P 170.7°).[TiCl3(NPMe3)]2 (2): Space group Pbca, Z = 8, structure solution with 698 observed independent reflections, R = 0.030. Lattice dimensions at -60°C: a = 1140.5, b = 1112.2, c = 1589.4 pm. In 2 the titanium atoms, which occur in trigonal bipyramidal coordination, are linked by the N atoms of the (NPMe3)- groups to form a centrosymmetric dimer with Ti—N bond lengths of 184.3 and 208.2 pm.[Ti2Cl5(NPMe2Ph)3] · CH2Cl2 (3): Space group Pca21, Z = 4, structure solution with 8477 observed independent reflections, R = 0.051. The lattice dimensions at 20°C are: a = 1221.0; b = 1407.5, c = 2139.3 pm. 3 can be understood as a reaction product of TiCl2(NPMe2Ph)2 and TiCl3(NPMe2Ph). In the resulting, heavily distorted Ti2N2-four-membered ring the Ti—N bond lenghts are 1804., 194.4, 199.2, and 234.6 pm. The longest Ti—N bond is in trans-position to the N atom of the terminal (NPMe2Ph)- ligand, in which the Ti—N distance is 175.6 pm. .[Ti3CL6(NPMe3)5][BPh4] (4): Space group P21/n, structure solution with 2846 observed independent reflections, R = 0.062. The lattice dimensions at 20°C are: a = 1495.2, b = 2335.4, c = 155,8 pm, β = 93.28°. In the cation of 4 the three titanium atoms along with three (NPMe3)- groups with μ2- N functions and two (NPMe3)- groups with μ3- N functions form a nation number 6 with two terminal chlorine atoms.
    Notes: Die Titelverbindungen entstehen aus Cp2TiCl2 bzw. Titantetrachlorid und den entsprechenden silylierten Phosphaniminen Me3SiNPMe3 bzw. Me3SiNPMe2Ph. Das Tetraphenyloborat-Derivat erhielten wir durch Umsetzung von [Ti3Cl6(NPMe3)5]Cl mit NaBPh4. Alle Verbindungen bilden gelbe, feuchtigkeitsempfindliche Kristalle, die durch IR-Spektroskopie und durch Kristallstrukturanalysen charakterisiert wurden.CpTiCl2(NPMe3) (1): Raumgruppe Pbca, Z = 8, Strukturlösung mit 1632 beobachteten unabhängigen Reflexen, R = 0,037. Gitterabmessungen bei 19°C: a = 1202,6; b = 1224,2; c = 1766,7 pm. Die Verbindung bildet monomere Moleküle mit dem (NPMe3)--Liganden in nahezu gestreckter Anordnung TiNP (Bindungswinkel 170,7°).[TiCl3(NPMe3)]2 (2): Raumgruppe Pbca, Z = 8, Strukturlösung mit 698 beobachteten unabhängigen Reflexen, R = 0,030. Gitterabmessungen bei -60°C: a = 1140,5; b = 1112,2; c = 1589,4 pm. In 2 sind die trigonal-bipyramidal koordinierten Titanatome über die N-Atome der (NPMe3)- - Gruppen zu einem zentrosymmetrischen Dimer mit TiN-Abständen von 184,3 und 208,2 pm verknüpft.[Ti2Cl5(NPMe2Ph)3] · CH2Cl2 (3): Raumgruppe Pca21, Z = 4, Strukturlösung mit 8477 beobachteten unabhängigen Reflexen, R = 0,051. Gitterabmessungen bei 20°C: a = 1221,0; b = 1407,5; c = 2139,3 pm. 3 läßt sich als Dimerisierungsprodukt aus TiCl2(NPMe2Ph)2 und TiCl3(NPMe2Ph) auffassen, wobei ein stark verzerrter ebener Ti2N2-Vierring mit TiN-Abständen von 180,4, 194,4, 199,2, und 234,6 pm entsteht. Die längste TiN-Bindung befindet sich in trans-Stellung zu dem N-Atom des terminal gebundenen (NPMe2Ph)--Liganden, der eine TiN-Bindungslänge von 175,6 pm aufweist.[Ti3Cl6(NPMe3)5][BPh4] (4): Raumgruppe P21/n, Z = 4, Strukturlösung mit 2846 beobachteten unabhängigen Reflexen, R = 0,062. Gitterabmessungen bei 20°C: a = 1495,2; b = 2335,4; c = 1555,8 pm, β = 93,28°. In dem Kation von 4 bilden die drei Titanatome zusammen mit drei (NPMe3)--Gruppen mit μ2-N-Funktion und zwei (NPMe3)--Gruppen mit μ3-N-Funktion eine trigonale Bipyramide. Zusammen mit den terminal gebundenen Chloratomen erreichen die Titanatome die Koordinationszahl sechs.
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  • 129
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    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1768-1776 
    ISSN: 0044-2313
    Keywords: Metallocene dichalcogenolene ; DNMR ; EPR, X-Ray ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Characterization of Metallocene Chelates of Heterocyclic 1,2-DithiolatesSynthesis and properties of metalocene dithiolene chelates Cp2ML with metal(IV) ions (M) of group IVA (Ti, Zr, Hf) and of vanadium with L = dmit (1,3-dithiole-2-thione-4,5-dithiolate), dmt (1,2-dithiole-3-thione-4,5-dithiolate), dmid (1,3-dithiole-2-one-4,5-dithiolate) and dmise (1,3-dithiole-2-selone-4,5-dithiolate) are described. The structures of these compounds were discussed using IR-, UV/VIS-, 1H-NMR-, 13C-NMR- and EPR data. The activation parameters of the chelate ring inversion of titanocene dithiolenes (Cp2TiL) and the x-ray structure of Cp2Ti(dmid) are given.
    Notes: Synthese und Eigenschaften neuer Metallocen-Dithiolen-Chelate Cp2ML der Metall(IV)-Ionen (M = Ti, Zr, Hf) sowie des Vanadiums mit L = dmit (1,3-Dithiol-2-thion-4,5-dithiolat), dmt (1,2-Dithiol-3-thion-4,5-dithiolat), dmid (1,3-Dithiol-2-on-4,5-dithiolat) und dmise (1,3-Dithiol-2-selon-4,5-dithiolat) werden beschrieben. Die Strukturen der Verbindungen werden anhand der IR-, UV/VIS-, Massen-, 1H-NMR-, 13C-NMR- bzw. EPR-Spektren diskutiert. Die durch dynamische Kernresonanzspektroskopie bestimmten Aktivierungs-parameter der Chelatringinversion der Titanocen-Dithiolene (Cp2TiL), sowie die Röntgenkristallstrukturanalyse von Cp2Ti(dmid) werden vorgestellt.
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  • 130
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1777-1780 
    ISSN: 0044-2313
    Keywords: Ternary intermetallic compounds ; cesium ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Ternary Compounds of Cesium and Elements of the 8th Transition Metal Group and the 5th Main GroupIn the ternary systems Cesium/element of the 8th transition metal group/element of the 5th main group some new compounds were found and investigated. Compounds of the formula Cs2MX2 (M = Pt, Pd, Ni; X = P, Sb, Bi) can be placed in a line with the K2PdP2-type structure. The new compound with the formula CsFe2Sb2 crystallizes in the ThCr2Si2-type structure. By single crystal measurements CsFe2As2 was found to crystallize in the space group I4/mmm with the lattice constants a = 389.43 pm and c = 1 509.97 pm.
    Notes: In den Dreistoffsystemen Caesium/Element der 8. Nebengruppe/Element der 5. Hauptgruppe konnten neue ternäre intermetallische Verbindungen synthetisiert und aufgrund ihrer Strukturmerkmale bekannten Strukturtypen zugeordnet werden. Die Verbindungen der Zusammensetzung Cs2MX2 (M = Pt, Pd, Ni; X = P, Sb, Bi) kristallisieren im K2PdP2-Typ. Die Verbindung der Zusammensetzung CsFe2Sb2 kristallisiert im ThCr2Si2-Typ. Einkristalluntersuchungen an einem Kristall von CsFe2As2 ergaben die Raumgruppe I4/mmm mit den Gitterkonstanten a = 389,43 pm, c = 1 509,97 pm.
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  • 131
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1781-1785 
    ISSN: 0044-2313
    Keywords: Nitridocobaltate ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ba[CoN]: A Low-Valency Nitridocobaltate with Angled Chains ∞1[CoN2/22-]Ba[CoN] is prepared by reaction of barium and cobalt (molar ratio Ba : Co = 1 : 2.5) in tantalum crucibles at 870°C with flowing nitrogen (1 atm) within a period of 96 h. After cooling down to room temperature (24°C/h) black single crystals of the ternary phase with a platy habit are obtained (orthorhombic, Pnma; a = 959.9(2) pm, b = 2 351.0(3) pm, c = 547.6(2) pm; Z = 20). The crystal structure of Ba[CoN] contains angled (planar) chains ∞1[CoN2/22-] which run along the [010]-direction (N—Co—N[°]: 178.5(5), 179.6(6), 180.0; Co—N—Co[°]: 82.9(6), 84.2(5), 177.1(8); Co—N[pm]: 174.6(12), 177.2(12), 181.9(13), 184.3(13), 187.1(12)). Nitrogen is in an octahedral coordination (N Ba4Co2) and is arranged in a distorted cubic close packing. Barium occupies one half of the tetrahedral holes (Ba—N[pm]: 274.8(16) - 308.2(12)). The cis-positions of the Co-atoms at the nitrogen coordination-octahedra cause short Co—Co contacts within the chains ∞1[CoN2/22-]. Through this, Co2-units (Co—Co[pm]: 247.8(4); bridged by nitrogen) and linear Co3-groups (Co—Co [pm]: 245.5(2); Co—Co—Co[°]: 180.0; bridged by nitrogen) alternate along the chains.The crystal structure of Ba[CoN] is closely related to the Ba[NiN] type structure.
    Notes: Ba[CoN] wird durch Umsetzung von Barium und Cobalt im molaren Verhältnis Ba: Co = 1 : 2,5 bei 870°C im Tantaltiegel mit strömendem Stickstoff (1 atm) dargestellt. Die Reaktionszeit beträgt 96 h. Nach Abkühlen auf Raumtemperatur (24°C/h) liegt die ternäre Phase in Form schwarzer Einkristalle mit plattigem Habitus vor (orthorhombisch, Pnma; a = 959,9(2) pm, b = 2 351,0(3) pm, c = 547,6(2) pm; Z = 20). Die Kristallstruktur von Ba[CoN] enthält gewinkelte (ebene) Ketten ∞1[CoN2/22-], die entlang [010] verlaufen (N—Co—N[°]: 178,5(5), 179,6(6), 180,0; Co—N—Co[°]: 82,9(6), 84,2(5), 177,1(8); Co—N[pm]: 174,6(12), 177,2(12) 181,9(13), 184,3(13), 187,1(12)). Stickstoff ist oktaedrisch koordiniert (N Ba4Co2) und bildet das Motiv einer verzerrt kubisch dichtesten Packung. Barium besetzt eine Hälfte der Tetraederlücken (Ba—N[pm]: 274,8(16) - 308,2(12)). Die cis-Positionierung der Co-Atome an den Stickstoff-Koordinationsoktaedern bedingt kurze Co—Co-Abstände innerhalb der Ketten ∞1[CoN2/22-], so daß von Stickstoff überbrückte Co2-Einheiten (Co—Co[pm]: 247,8(4)) und gestreckte, von Stickstoff überbrückte Co3-Gruppen (Co—Co[pm]: 245,5(2); Co—Co—Co[°]: 180,0) in Kettenrichtung alternierend aufeinanderfolgen.Die Kristallstruktur von Ba[CoN] zeigt enge Verwandtschaft zum Ba[NiN]-Typ.
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  • 132
    ISSN: 0044-2313
    Keywords: Nitrido Compounds, Nitrenes, Rhenium complexes, Metal induced condensation, X-ray diffraction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed-ligand Complexes of Rhenium. V. The Formation of Nitrene Complexes by Condensation of Acetone at Coordinated Nitrido Ligands. Syntheses and Structures of fac-[Re{NC(CH3)2CH2C(O)CH3}X3(Me2PhP)2] Complexes (X = Cl, Br)The reaction of rhenium(V)-mixed-ligand complexes of the general formula [ReN(Cl)(Me2PhP)2(R2tcb)] (HR2tcb = N—(N,N-dialkylthiocarbamoyl)benzamidine) with HCl or HBr in acetone initializes a condensation of the solvent and results in nitrene-like compounds as a consequence of a nucleophilic attack of the coordinated nitrido ligand on the condensed acetone. The chelate ligands are removed during this reaction and complexes of the type fac-[Re{NC(CH3)2CH2C(O)CH3}X3(Me2PhP)2] (X = Cl, Br) are formed.fac-[Re{NC(CH3)2CH2C(O)CH3}Cl3(Me2PhP)2] crystallizes triclinic in the space group P1, a = 8.575(4); b = 9.088(3); c = 18.389(9) Å; α = 75.67(3)°, β = 85.30(3)°, γ = 70.58(4)°; Z = 2. A final R value of 0.031 was obtained on the basis of 6011 independent reflections with I ≥ 2σ(I). Rhenium is coordinated in a distorted octahedral environment with the three chloro ligands in facial positions. The rhenium-nitrogen bond (1,68(1) Å) is only slightly longer than typical Re—N bonding distances in nitrido complexes.fac-[Re{NC(CH3)2CH2C(O)CH3}Br3(Me2PhP)2] is isomorphous with the chloro complex. Triclinic cell with a = 8.625(4); b = 9.198(3); c = 18.581(5) Å; α = 75.62(3)°, β = 85.40(3)°, γ = 70.91(3)°; Z = 2. The R value converged at 0.049 on the basis of 3644 independent reflections with I ≥ 2σ(I). fac-[Re{NC(CH3)2CH2C(O)CH3}Cl3(Me2PhP)2] as well as fac-[Re{NC(CH3)2CH2C(O)CH3}Br3(Me2PhP)2] crystallizes in the noncentrosymmetric space group P1.
    Notes: Die Umsetzung von Rhenium(V)-Gemischtligandkomplexen des Typs [ReN(Cl)(Me2PhP)2(R2tcb)] (HR2tcb = N—(N,N-Dialkylthiocarbamoyl)benzamidin) mit Halogenwasserstoffsäuren in Aceton führt zur Kondensation des Lösungsmittels und zur Ausbildung nitrenartiger Komplex-verbindungen durch Reaktion des Kondensationsproduktes mit dem nukleophilen Nitrid - Stickstoff. Die Chelatliganden werden im Verlauf der Reaktion abgespalten und es entstehen Komplexe der allgemeinen Zusammensetzung fac-[Re{NC(CH3)2CH2C(O)CH3}X3(Me2PhP)2] (X = Cl, Br).fac-[Re{NC(CH3)2CH2C(O)CH3}Cl3(Me2PhP)2] kristallisiert triklin in der Raumgruppe P1, a = 8,575(4); b = 9,088(3); c = 18,389(9) Å; α = 75,67(3)°, β = 85,30(3)°, γ = 70,58(4)°; Z = 2. Mit 6011 unabhängigen Reflexen I ≥ 2σ(I) konnte ein R-Wert von 0,031 erreicht werden. Rhenium befindet sich in einer verzerrt oktaedrischen Umgebung mit facial angeordneten Chloro-Liganden. Die Rhenium - Stickstoff-Bindung ist mit 1,68(1) Å nur geringfügig größer als typische Re—N-Abstände in Nitridokomplexen.fac-[Re{NC(CH3)2CH2C(O)CH3}Br3(Me2PhP)2] ist isostrukturell mit dem Chlorokomplex. Trikline Elementarzelle mit a = 8,625(4); b = 9,198(3); c = 18,581(5) Å; α = 75,62(3)°, β = 85,40(3)°, γ = 70,91(3)°; Z = 2. Der R-Wert konvergierte gegen 0,049 unter Verwendung von 3 644 unabhängigen Reflexen mit I ≥ 2σ(I). Ebenso wie fac-[Re{NC(CH3)2CH2C(O)CH3}Cl3(Me2PhP)2] kristallisiert fac-[Re{NC(CH3)2CH2C(O)CH3}Br3(Me2PhP)2] in der nicht-zentrosymmetrischen Raumgruppe P1.
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  • 133
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1799-1804 
    ISSN: 0044-2313
    Keywords: 1,4,2λ5,5λ5-Dioxadiphosphorinane ; NMR spectra ; Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: P,P′-(2,5-Dihydroxy-3,6-dimethyl-2,5-dioxo-2λ5,5λ5-[1,4,2,5]dioxadiphosphinane-2,5-diyl)-bis-phosphonic AcidThe tetrahydrate 1 of the title compound crystallizes in the monoclinic space group P21/c with a = 845.8, b = 1 098, c = 981.7 pm, β = 113.02° and Z = 2. The anions of the oxonium compound (H3O+ · H2O)2(C4H10O12P42-) are layered by hydrogen bridges. The 1H, 13C and 31P NMR spectra (4 and 5 spin systems) are discussed.
    Notes: C4H12O12P4 · 4 H2O (1), das Tetrahydrat der Titelverbindung, kristallsiert monoklin in der Raumgruppe P21/c mit a = 845,8, b = 1 098, c = 981,7 pm, β = 113,02° und Z = 2. 1 liegt als Oxoniumsalz (H3O+ · H2O)2(C4H10O12P42-) vor, in dem die Anionen über H-Brücken zu Schichten verknüpft sind. Die 4- und 5-Spinsysteme der 1H-, 13C- und 31P-NMR-Spektren werden detailliert analysiert.
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  • 134
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1793-1798 
    ISSN: 0044-2313
    Keywords: Manganese formate dihydrate, copper formate dihydrate, mixed crystals ; solubility, unit cell dimensions ; IR spectra, Raman spectra ; metal ion distribution ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Verteilung der Metallionen und Löslichkeit von Mn1-xCux(HCOO)2 · 2 H2O-MischkristallenDie Verteilung der Metallionen in Mn1-xCux(HCOO)2 · 2(H,D)2O-Mischkristallen auf beide Metall-Lagen wird mit Hilfe von IR- und Raman-Spektren analysiert. Der Einfluß der Metallionen zeigt sich insbesondere in den Spektralbereichen 3 200-3 400 cm-1 (vOH), 2 875-2 990 cm-1 (vCH), 2 300-2 500 cm-1 (vOD von matrixisolierten HDO-Molekülen), 1 350-1 400 cm-1 (symmetrische CO2-Streckschwingungen), 570-950 cm-1 (H2O-Librationen) und 490 cm-1 (M—O Gitterschwingungen). Die Verschiebung dieser Banden mit zunehmendem Kupfergehalt belegt, daß Cu2+ nur die von HCOO- koordinierte Lage M(1) besetzt. Die Stärke der Wasserstoffbrücken nimmt aufgrund des größeren synergetischen Effektes von Cu2+ beim Übergang von den Mangan- zu Kupfer-reichen Mischkristallen zu. Die Löslichkeit und die Gitterkonstanten von Mn1-xCux(HCOO)2 · 2 H2O werden mitgeteilt. Eutonischer Bereich: 0,65 ≥ x ≥ 0,5.
    Notes: The metal ion distribution on the two metal sites of monoclinic Mn1-xCux(HCOO)2 · 2(H,D)2O mixed crystals are studied by infrared and Raman spectroscopic methods. The spectral regions 3 200-3 400 cm-1 (vOH), 2 875-2 990 cm-1 (vCH), 2 330-2 500 cm-1 (vOD of matrix isolated HDO molecules), 1 350-1 400 cm-1 (symmetric CO2 stretching modes), 570-950 cm-1 (H2O librations), and 490 cm-1 (M—O lattice modes) are mostly sensitive to the metal ions present. The frequency shifts of these bands with increasing content of copper show that Cu2+ prefers the M(1) site, coordinated by HCOO- only. The strengths of the hydrogen bonds increase on going from manganese to copper formate, due to the increased synergetic effect of Cu2+. Solubility and X-ray data of the mixed crystals are included. Irrespective of the same crystal structure, two series of mixed crystals are formed: eutonic area at 0.65 ≥ x ≥ 0.5.
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  • 135
    ISSN: 0044-2313
    Keywords: Iodoplatinates ; Preparation ; Crystal Structure ; Raman Spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Characterization of Iodoplatinates MexNH4-xPtI4 (x = 2-4), Mixed Valence Octaiododiplatinates(II,IV) with Pt2I8 GroupsIodoplatinates APtI4 (A = MexNH4-x with x = 2-4) have been prepared by partial oxidation of the correspondent hexaiododiplatinates(II) A2Pt2I6 with I2 in methanolic solutions. X-ray structure analyses of the bronze-coloured needle-shaped crystals of the compounds showed rows of dinuclear anions Pt2I82-, built up by edgesharing planar PtI4 groups with PtII und octahedral PtI6 groups with PtIV. The different space requirement of the cations leads to the formation of three different structures. Within the anion stacks weak intermolecular PtIV—I … PtII interactions are detectable by Raman spectroscopy.
    Notes: Iodoplatinate APtI4 (A = MexNH4-x mit x = 2-4) wurden durch partielle Oxidation der entsprechenden Hexaiododiplatinate(II) A2Pt2I6 mit I2 in methanolischer Lösung erhalten. Röntgenstrukturanalysen der in Form bronzefarbener Nadeln kristallisierenden Verbindungen ergaben, daß gemischtvalente Octaiododiplatinate(II,IV) mit zweikernigen Anionen Pt2I82- vorliegen, bei denen jeweils eine planare PtI4- und eine oktaedrische PtI6-Gruppe über eine gemeinsame Kante verknüpft sind. Der unterschiedliche Platzbedarf der Kationen führt zur Ausbildung von drei verschiedenen Strukturen, bei denen die komplexen Baugruppen und die Kationen jeweils getrennt stapelförmig angeordnet sind. Mit Hilfe der Ramanspektroskopie sind schwache intermolekulare PtIV—I … PtII- Wechselwirkungen innerhalb der Anionenstapel feststellbar.
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  • 136
    ISSN: 0044-2313
    Keywords: Carbosilanes ; Cu-catalyzed reactions of silicon with C-chlorinated 1,1,3,3,5,5-hexachloro-1,3,5-trisilacyclohexanes ; crystal structures of hexadecachloro-1,3,5,7,9,11,13,14-octasiladispiro[5.1.5.1]tetradecane ; decachloro-1,3,5,7,9,11-hexasilatricyclo[6.4.0.02,7]dodecane and decachloro-2-trichlorosilyl-1,3,5,7,9,11-hexasilatricyclo[6.4.0.02,7]dodecane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of Organosilicon Compounds 113. Reactions of C-chlorinated 1,1,3,3,5,5-Hexachloro-1,3,5-trisilacyclohexanes with Si(Cu cat.). Structures of Hexadecachloro-1,3,5,7,9,11,13,14-octasiladispiro[5.1.5.1]tetradecane 12, Decachloro-1,3,5,7,9,11-hexasilatricyclo[6.4.0.02,7]dodecane 13 and Decachloro-2-trichlorosilyl-1,3,5,7,9,11-hexasilatricyclo[6.4.0.02,7]dodecane 14Elemental Si(Cu cat.) was treated with 1,1,2,2,3,3,5,5-octachloro-1,3,5-trisilacyclohexane 3, 1,1,2,2,3,3,4,4,5,5-decachloro-1,3,5-trisilacyclohexane 4 and with (Cl2Si—CCl2)3 5, resp., in a stirred bed reactor at 330°C. The products can be understood as to be formed by silylation, hydrogenation, degradation, rearrangement and condensation reactions all of them starting from the CCl2 groups of the trisilacyclohexanes. Especially remarkable is Si8C6H8Cl16 12 with a C-spiro linked framework formed by a trisilacyclohexane, a disilacyclobutane and another trisilacyclohexane building block. In two further tricyclic carbosilanes Si6C6H10Cl10 13 and Si7C6H9Cl13 14, two trisilacyclohexane rings each share an opposite Si—C bond with a disilacyclobutane. Another group of compounds includes compounds consisting of two 1,3,5-trisilacyclohexane rings linked by either a C=C or a C=C=C unit. Moreover some derivatives of 1,3-disilacyclopentenes are formed obviously by a contraction of the C-chlorinated 1,3,5-trisilacyclohexane rings. Compound 12 crystallizes in the monoclinic space group P21/n (no. 14) with a = 1 307.8, b = 1 184.2, c = 984.4 pm, β = 93.58° and Z = 2 molecules per unit cell. 13 crystallizes in the triclinic space group P1 (no. 2) with a = 885.7, b = 911.6, c = 868.3 pm, α = 113.15°, β = 75.36° γ = 119.22° and Z = 1. 14 crystallizes in the monoclinic space group P21/c (no. 14) with a = 1853.2, b = 912.9, c = 1725.3 pm, β = 112.69° and Z = 4.
    Notes: 1,1,2,2,3,3,5,5,-Octachlor-1,3,5-trisilacyclohexan 3, 1,1,2,2,3,3,4,4,5,5-Decachlor-1,3,5-trisilacyclohexan 4 und (Cl2Si—CCl2)3 5 wurden mit Si(Cu) bzw. Cu im Rührbett bei 330°C umgesetzt. Die Reaktionen gehen von den CCl2-Gruppen der Trisilacyclohexane aus, und die verschiedenen Reaktionsprodukte sind durch Silylierung, Hydrierung, Kondensation und Umlagerung zu erklären. Besonders bemerkenswert ist das Si8C6H8Cl16 12, in dessen Grundgerüst zwei 1,3,5-Trisilacyclohexane über einen Disilacyclobutanring C-spiroverbrückt sind. In zwei tricyclischen Carbosilanen, Si6C6H10Cl10 13 und Si7C6H9Cl13 14, sind zwei Trisilacyclohexane über einen Disilacyclobutanring verbunden, der unter Ausbildung von zwei Si—C-Bindungen zwischen gegenüberliegenden SiCl- und CCl-Gruppen aufgebaut ist. Eine weitere Gruppe enthält Verbindungen, in denen zwei 1,3,5-Trisilacyclohexanringe entweder über eine C=C- oder C=C=C-Gruppe verbunden sind. Es entstehen auch 1,3-Disilacyclopentenderivate, deren Bildung auf eine Ringverengung der C-chlorierten 1,3,5-Trisilacyclohexane zurückgeführt wird. Verbindung 12 kristallisiert monoklin in der Raumgruppe P21/n (Nr. 14) mit a = 1 307,8, b = 1 184,2, c = 984,4 pm, β = 93,58° und Z = 2 Molekülen pro Elementarzelle; 13: triklin in der Raumgruppe P1 (Nr. 2) mit a = 885,7, b = 911,6, c = 868,3 pm, α = 113,15°, β = 75,36°, γ = 119.22° und Z = 1; 14: monoklin in der Raumgruppe P21/c (Nr. 14) mit a = 1 853,2, b = 912,9, c = 1 725,3 pm, β = 112.69° und Z = 4.
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  • 137
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 2014-2019 
    ISSN: 0044-2313
    Keywords: Phosphorus nitrides ; nitrido sodalites ; synthesis ; crystal structure ; i.r. data ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nitrido Sodalites. I Synthesis, Crystal Structure, and Properties of Zn7-xH2x [P12N24]Cl2 with 0 ≤ x ≤ 3The nitrido sodalites Zn7-xH2x[P12N24]Cl2 with 0 ≤ x ≤ 3 are obtained by heterogeneous pressure-ammonolysis of P3N5 at presence of ZnCl2 (T = 650°C). These compounds are available too by reaction of ZnCl2, (PNCl2)3, and NH4Cl at 700°C. The crystal structures of four representatives of the above mentioned compounds have been refined by the Rietveld full-profile technique using X-ray powder diffractometer data (I43m, a = 821.61(4) to 824.21(1) pm, Z = 1). In the solid a three-dimensional framework of corner-sharing PN4-tetrahedra occurs (P—N: 163.6 pm, P—N—P: 125.6°, mean values) which is isosteric with the sodalite type of structure. In the center of the β-cages Cl- ions have been found, which are tetrahedrally coordinated by Zn2+ ions. The Zn2+ ions are statistically disordered. According to the phase-width observed (0 ≤ x ≤ 3) the Zn2+ ions may be partially replaced each by two hydrogen atoms which on the other hand are covalently bonded to nitrogen atoms of the P—N framework. The IR-spectra of these compounds show characteristic vibrations.
    Notes: Die Nitrido-Sodalithe Zn7-xH2x[P12N24]Cl2 mit 0 ≤ x ≤ 3 wurden durch heterogene Druckammonolyse von P3N5 in Gegenwart von ZnCl2 (T = 650°C) dargestellt. Die Verbindungen sind auch zugänglich durch Umsetzung von ZnCl2, (PNCl2)3 und NH4Cl bei 700°C. Die Kristallstrukturen von vier ausgewählten Vertretern der obigen Verbindungsreihe wurden auf der Basis von Röntgen-Pulverdiffraktometerdaten mit Hilfe der Rietveld-Methode verfeinert (I43m, a = 821,61(4) bis 824,21(1) pm, Z = 1). Im Festkörper liegt eine dreidimensionale Gerüststruktur allseitig eckenverknüpfter PN4-Tetraeder vor (P—N: 163,6 pm, P—N—P: 125,6°, Mittelwerte), die dem Sodalith-Typ entspricht. Im Zentrum der β-Käfige befinden sich Cl--Ionen, die ihrerseits tetraedrisch durch Zn2+-Ionen umgeben sind. Die Zn2+-Positionen sind statistisch besetzt und gemäß der angegebenen Phasenbreite (0 ≤ x ≤ 3) kann ein Teil der Zn2+-Ionen durch jeweils zwei H-Atome ersetzt werden, die ihrerseits kovalent an Stickstoffatome des P—N-Gerüstes gebunden sind. Im IR-Spektrum der Verbindungen werden charakteristische Schwingungsbanden beobachtet.
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  • 138
    ISSN: 0044-2313
    Keywords: Hexaisopropyltetradecaphosphane(6) ; 4,5,6,10,12,14-hexaisopropylpentacyclo[9.2.1.02,9 .03,7 .08,13]tetradecaphosphane ; Hexaisopropylhexadecaphosphane(6) ; 5,6,7,11,14,15-Hexaisopropylhexacyclo[7.7.0.02,13 .03,10 .04,8 .012,16]hexadecaphosphane ; Polycyclic Phosphanes ; Phosphorus Hydrides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus. 230. Hexaisopropyltetradecaphosphane(6), P14i-Pr6, and Hexaisopropylhexadecaphosphane(6), P16i-Pr6  -  Formation and Structural Determination by 31P-NMR SpectroscopyHexaisopropyltetradecaphosphane(6) (1) and hexaiso-propylhexadecaphosphane(6) (2) are formed together with other isopropylpolycyclophosphanes by the reaction of i-PrPCl2 with P4 and magnesium and have been enriched to 30 mol% and 10 mol%, respectively. According to 31P-NMR spectroscopic investigations, the novel conjuncto-phosphane skeletons of 1 and 2 are the annelation products of a P5 ring with a P11(5) or a P13(5) partial skeleton, respectively, joined by a common P2 bridge. Thus, 1 is 4,5,6,10,12,14-hexaisopropylpentacyclo-[9.2.1.02,9 .03,7 .08,13]tetradecaphosphane and 2 is 5,6,7,11,14,15-hexaisopropylhexacyclo[7.7.0.02,13 .03,10 .04,8 .012,16]hexadecaphosphane. The phosphorus hydrides P14H16 and P16H6 have the same skeletal structures which are also intermediate stages in the formation of Hittorf's phosphorus.
    Notes: Hexaisopropyl-tetradecaphosphan(6) (1) und Hexaisopropyl-hexadecaphosphan(6) (2) werden zusammen mit anderen Isopropylpolycyclophosphanen bei der Reaktion von i-PrPCl2, P4 und Magnesium gebildet und konnten auf 30 Mol-% bzw. 10 Mol-% angereichert werden. Nach 31P-NMR-spektroskopischen Untersuchungen ist in den neuen Konjunkto-Phosphangerüsten von 1 und 2 jeweils ein P5-Ring mit einem P11(5)- bzw. P13(5)-Teilgerüst über eine gemeinsame P2-Brücke annelliert. Demnach handelt es sich bei 1 um 4,5,6,10,12,14-Hexaisopropyl-pentacyclo[9.2.1.02,9 .03,7 .08,13]-tetradecaphosphan, bei 2 um 5,6,7,11,14,15-Hexaisopropyl-hexacyclo[7.7.0.02,13 .03,10 .04,8 .012,16]hexadecaphosphan. Die Phosphorwasserstoff-Verbindungen P14H6 und P16H6 weisen die gleichen Gerüststrukturen auf, die auch Zwischenstufen beim Aufbau des Hittorfschen Phosphors sind.
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  • 139
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 2026-2032 
    ISSN: 0044-2313
    Keywords: Lithium silicate plumbate ; preparation ; crystal structure ; MAPLE and CHARDI calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Li10Si2PbIIO10 = Li20[(SiO4)4(OPbO2PbO)]  -  The first „mixed“ Silicate-Plumbate(II)Colourless crystals of Li10Si2PbO10 were obtained by heating a well-ground mixture of LiPb, Li2O2 and „SiO2“ (deriving from Duran glas) in Ag-tubes (650°C; 60 d). The crystal structure was determined (four-circle diffractometer data, Mo—Kα-, 1 474 Io(hkl), R = 4.2%, Rw = 2.8%, parameters see text). The silicate-plumbate crystallizes monoclinic (space group C2/m; I. T. No. 12) with a = 2985.1(4); b = 610.6(6); c = 512.8(1) pm, β = 99.70(9)° (four-circle data), Z = 4.Further the Madelung Part of Lattice Energy (MAPLE), Effective Coordination Numbers (ECoN), the Mean Fictive Ionic Radii (MEFIR) and the Charge Distribution (CHARDI) are being calculated.
    Notes: Farblose Kristalle von Li10Si2PbO10 entstanden beim Tempern inniger Gemenge von LiPb, Li2O2 und „SiO2“ (aus Duranglas) in Ag-Bömbchen (650°C; 60 d). Die Kristallstruktur wurde aufgeklärt (Vierkreisdiffraktometerdaten, Mo—Kα-, 1 474 Io(hkl), R = 4,2%, Rw = 2,8%, Parameter siehe Text). Das Silicat-Plumbat kristallisiert monoklin (Raumgruppe C2/m; I. T. No. 12) mit a = 2 985,1(4); b = 610,6(1); c = 512,8(1) pm; β = 99,70(9) (Vierkreisdaten), Z = 4.Ferner werden der Madelunganteil der Gitterenergie (MAPLE), Effektive Koordinationszahlen (ECoN), die Mittleren Fiktiven Ionenradien (MEFIR) sowie die Ladungsverteilung (CHARDI) berechnet.
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  • 140
    ISSN: 0044-2313
    Keywords: α-Functionalized methylphenyl phosphines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: α-Functionalized 2-Methylphenyl Phosphines, 2-(HE—CH2)—C6H4—PH2 (E: O, NR, PH) I. Preparation, Deprotonation and Silylation BehaviourBy reaction of different ortho-substituted phenyl phosphonates 2-X—C6H4—PO3R2 (X = COOR, CONHR, PO3R2) with LiAlH4 α-functionalized 2-methylphenyl phosphines 2-(HE—CH2)—C6H4—PH2 (E: O, NPh, PH) are accessible. The title compounds are characterized by deprotonation and silylation experiments.
    Notes: Durch Reduktion verschieden ortho-substituierter Benzolphosphonsäureester 2-X—C6H4—PO3R2 (X = COOR, CONHR, PO3R2) mit LiAlH4 werden die α-funktionellen 2-Methylphenylphosphane 2-(HE—CH2)—C6H4—PH2 (E: O, NPh, PH) zugänglich. Deren Metallierungs- und Silylierungsverhalten wird 31P-NMR-spektroskopisch untersucht.
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  • 141
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 2048-2052 
    ISSN: 0044-2313
    Keywords: Nickel(0) complexes ; isocyanide ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Triphenylphosphane Nickel(0) Complexes with Isocyanide Ligands  -  [(RNC)nNi(PPh3)4-n] (n = 1-3)Synthesis and properties of the isocyanide triphenylphosphane nickel(0) complexes [(RNC)Ni(PPh3)3], [(RNC)2Ni(PPh3)2] and [(RNC)3Ni(PPh3)] (R = tBu, Cy, PhCH2, p-TosCH2) are described. I.r. and 31P n.m.r. spectra were recorded and the X-ray crystal structure of [(PhCH2NC)2Ni(PPh3)2] was determined.
    Notes: Synthese und Eigenschaften von Isocyanid-Triphenylphosphan-Nickel(0)-Komplexen der Typen [(RNC)Ni(PPh3)3], [(RNC)2Ni(PPh3)2] und [(RNC)3Ni(PPh3)] (R = tBu, Cy, PhCH2, p-TosCH2) werden beschrieben.Die Charakterisierung der genannten Komplexe erfolgte mit Hilfe der IR- und 31P-NMR-Spektroskopie, von [(PhCH2NC)2Ni(PPh3)2] wurde die Molekülstruktur bestimmt.
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  • 142
    ISSN: 0044-2313
    Keywords: Phoshinophosphinidene-phosphoranes, tBu2P—P=P(Me)tBu2, tBu(Me3Si)P—P=P(Me)tBu2, tBu2P—P=P(Br)tBu2 ; Synthesis ; Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of Phosphinophosphinidene-phosphoranes tBu2P—P=P(Me)tBu2 1, tBu(Me3Si)P—P=P(Me)tBu2 2, and tBu2P—P=P(Br)tBu2 3A new method for the synthesis of 1 and 2 (Formulae see „Inhaltsübersicht“) is reported based on the reaction of 5 with substitution reagents (Me2SO4 or CH3Cl). The results of the X-ray structure determination of 1 and 2 are given and compared with those of 3. While in 3 one P—P distance corresponds to a double bond and the other P—P distance to a single bond (difference 12.5 pm) the differences of the P—P distances in 1 and 2 are much smaller: 5.28 pm in 1, 4.68 pm in 2. Both 1 and 2 crystallize monoclinic in the space group P21/n (Z = 4). 2 additionally contains two disordered molecules of the solvent pentane in the unit cell. Parameters of 1: a = 884.32(8) pm, b = 1 924.67(25) pm, c = 1 277.07(13) pm, β = 100.816(8)°, and of 2: a = 1 101.93(12) pm, b = 1 712.46(18) pm, c = 1 395.81(12) pm, β = 111.159(7)°, all data collected at 143 K. The skeleton of the three P atoms is bent (PPP angle 100.95° for 1, 100.29° for 2 and 105.77° for 3). Ab initio SCF calculations are used to discuss the bonding situation in the molecular skeleton of the three P atoms of 1 and 3. The results show a significant contribution of the ionic structure R2P—P(-)—P(+)(X)R2. The structure with (partially) charged P atoms is stabilized by bulky polarizable groups R (as tBu) as compared to the fully covalent structure R2P—P(X)—PR2.
    Notes: Es wird ein neuer Weg zur Bildung von tBu2P—P=P(Me)tBu2 1 und tBu(Me3Si)P—P=P(Me)tBu2 2 mitgeteilt, der auf der Umsetzung von LiP[P(tBu)2]2 5 mit Substitutionsreagenzien (Me2SO4, CH3Cl) basiert. Die Ergebnisse der Kristallstrukturuntersuchung von 1 und 2 werden mitgeteilt und mit denen des tBu2P—P=P(Br)tBu2 3 verglichen. Während in 3 der eine Abstand einer Doppelbindung entspricht und der andere einer Einfachbindung (Differenz 12,5 pm) sind die Differenzen der P—P-Abstände in 1 und 2 weit geringer, in 1 5,28 pm, in 2 4,68 pm. 1 und 2 kristallisieren beide monoklin in der Raumgruppe P21/n mit vier Formeleinheiten in der Elementarzelle. Bei 2 werden zusätzlich zwei fehlgeordnete Moleküle des Lösungsmittels Pentan in der Elementarzelle eingebaut. Parameter von 1: a = 884,32(8) pm, b = 1 924,67(25) pm, c = 1 277,07(13) pm, β = 100,816(8)°, 2: a = 1 101,93(12) pm, b = 1 712,46(18) pm, c = 1 395,81(12) pm, β = 111,159(7)°, jeweils bei der Meßtemperatur 143 K. Das Gerüst der drei P-Atome ist gewinkelt, Winkel in 1 100,95°, in 2 100,29° und in 3 auf 105,77° aufgeweitert. Mit Hilfe von ab initio SCF-Rechnungen werden die Bindungsverhältnisse im Molekülgerüst der drei P-Atome in 1 und 3 diskutiert. Es zeigt sich ein deutlicher Beitrag der ionogenen Struktur R2P—P(-)—P(+)(X)R2. Die Struktur mit separierten (Teil-)Ladungen wird durch große, polarisierte Gruppen R wie tBu im Vergleich zur (unpolaren) normalvalenten Verbindung R2P—P(X)—PR2 stabilisiert.
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  • 143
    ISSN: 0044-2313
    Keywords: Dinuclear cobalt complexes ; oxidative addition and substitution reactions ; formation of dinuclear and chiral complex salts ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bis(cyclopentadienyl)methane-bridged Dinuclear Complexes. VIII. Dinuclear Cobalt Complexes with the Dianion of Bis(cyclopentadienyl)methane and Bis(tetramethylcyclopentadienyl)dimethylsilane as Bridging LigandsThe dinuclear cobalt complex [CH2(C5H4)2][Co(CO)2]2 (4) which is obtained from [Co(CO)4I] (2) and Li2[CH2(C5H4)2] (3) in 75% yield reacts with PMe3, PiPr3, P2Me4, Me2PCH2CH2PMe2 and (EtO)2POP(OEt)2, to the compounds 5-9 substituting one CO ligand per cobalt atom. Oxidative addition of CH3I to [CH2(C5H4)2][Co(CO)(PMe3)]2 (5) leads to the formation of the dinuclear cobalt(III) complex [CH2(C5H4)2][Co(COCH3)(PMe3)I]2 (11). The reaction of 4 with iodide generates [CH2(C5H4)2][Co(CO)I2]2 (12) which with PMe3, P(OMe)3, P(OiPr)3, and CNMe reacts under CO substitution to [CH2(C5H4)2][Co(L)I2]2 (13-16) and with PMe2H to {[CH2(C5H4)2][Co(PMe2H)3]2}I4 (17). The electrophilic addition reactions of NH4PF6 and CH3I to [CH2(C5H4)2][Co(PMe3)2]2 (20) produce the complex salts {[CH2(C5H4)2][CoR(PMe3)2]2}X2 (21: R = H; 22: R = CH3). From 22a (X = I) and LiCH3 the dinuclear tetramethyldicobalt compound [CH2(C5H4)2] · [Co(CH3)2(PMe3)]2 (23) is obtained which further reacts, via the intermediate 24, to the chiral complex {[CH2(C5H4)2] · [CoCH3(PMe3)P(OMe)3]2}(PF6)2 (25). The reaction of 20 with C2(CN)4 and E- or Z-C2H2(CO2Me)2 gives the olefin(trimethylphosphine) cobalt(I) derivatives 26 und 27. The synthesis of the dinuclear compounds 31-38 with [Me2Si(C5Me4)2]2- as the bridging unit is also described.
    Notes: Der Cobalt-Zweikernkomplex [CH2(C5H4)2] · [Co(CO)2]2 (4), der aus [Co(CO)4I] (2) und Li2[CH2(C5H4)2] (3) mit 75%iger Ausbeute entsteht, reagiert mit PMe3, PiPr3, P2Me4, Me2PCH2CH2PMe2 und (EtO)2POP(OEt)2 unter Substitution je eines CO-Liganden pro Cobaltatom zu den Verbindungen 5-9. Aus [CH2(C5H4)2][Co(CO)(PMe3)]2 (5) und CH3I erhält man durch oxidative Addition den zweikernigen Cobalt(III)-Komplex [CH2(C5H4)2][Co(COCH3)(PMe3)I]2 (11). Die Umsetzung von 4 mit Iod liefert die Verbindung [CH2(C5H4)2][Co(CO)I2]2 (12), die mit PMe3, P(OMe)3, P(OiPr)3 und CNMe unter CO-Verdrängung zu [CH2(C5H4)2] · [Co(L)I2]2 (13-16) und mit PMe2H zu {[CH2(C5H4)2] · [Co(PMe2H)3]2}I4 (17) reagiert. Die Umsetzungen von [CH2(C5H4)2][Co(PMe3)2]2 (20) mit NH4PF6 und CH3I führen unter elektrophiler Addition zu den Komplexsalzen {[CH2(C5H4)2][CoR(PMe3)2]2}X2 (21: R = H; 22: R = CH3). Aus 22a (X = I) und LiCH3 ist die zweikernige Tetramethyldicobalt-Verbindung [CH2(C5H4)2][Co(CH3)2(PMe3)]2 (23) und daraus über die Zwischenstufe 24 der chirale Komplex {[CH2(C5H4)2][CoCH3(PMe3)P(OMe)3]2}(PF6)2 (25) zugänglich. Aus 20 und C2(CN)4 und E- oder Z-C2H2(CO2Me)2 erhält man die Olefin(trimethylphosphan)cobalt(I)-Derivate 26 und 27. Die Synthese der Zweikernkomplexe 31-38 mit [Me2Si(C5Me4)2]2- als verbrückender Einheit wird ebenfalls beschrieben.
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  • 144
    ISSN: 0044-2313
    Keywords: Sodium hydroxide hydrates ; crystal structure ; hydrogen bonding ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrates of Weak and Strong Bases. XI. The Crystal Structures of NaOH · 3,5H2O and NaOH · 7 H2O. A RefinementThe crystal structures of the hydrates NaOH · 3,5 H2O (space group P21/c, Z = 8 formula units per unit cell; lattice parameters: a = 6.481, b = 12.460, c = 11.681 Å, β = 104.12° at -100°C) and NaOH · 7 H2O (P21/c, Z = 4; a = 7.344, b = 16.356, c = 6.897 Å, β = 92.91° at -150°C) have been redetermined using MoKα diffractometer data. The obtained refinement of the structures, including the localization also of the H atoms for the first time, has led to new findings with respect to the H bonds. In particular, in both hydrates there is one such interaction of the rare type OH- … OH2, from an OH- ion to an H2O molecule, i. e. with the OH- ion as the proton donor.
    Notes: Die Kristallstrukturen der Hydrate NaOH · 3,5H2O (Raumgruppe P21/c, Z = 8 Formeleinheiten pro Elementarzelle; Gitterkonstanten a = 6,481, b = 12,460, c = 11,681 Å, β = 104,12° bei -100°C) und NaOH · 7 H2O (P21/c, Z = 4; a = 7,344, b = 16,356, c = 6,897 Å, β = 92,91° bei -150°C) wurden mit MoKα-Diffraktometerdaten einer Zweitbestimmung unterzogen. Die erreichte Präzisierung der Strukturen, einschließlich der erstmaligen Lokalisierung auch der H-Atome, führte zu neuen Erkenntnissen bezüglich der H-Brücken. Insbesondere gibt es in beiden Hydraten eine solche Wechselwirkung vom seltenen Typ OH- · OH2, von einem OH--Ion zu einem H2O-Molekül, also mit dem OH--Ion als Protondonor.
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  • 145
    ISSN: 0044-2313
    Keywords: New Lithosilicates ; preparation ; crystal structure ; MAPLE and CHARDI calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: More Silicates with „Stuffed Pyrgoms“: CsKNaLi9{Li[SiO4]}4, CsKNa2Li8{Li[SiO4]}4, RbNa3Li8{Li[SiO4]}4 [1] and RbNaLi4{Li[SiO4]}2 [2]Single crystals of the new silicates CsKNaLi9{Li[SiO4]}4, CsKNa2Li8{Li[SiO4]}4, RbNa3Li8{Li[SiO4]}4 and RbNaLi4{Li[SiO4]}2 as well as powder (Rb-containing compounds only) were obtained for the first time. The samples were prepared by heating well ground mixtures of the binary oxides in Ni and Ag tubes, respectively. The structure determination was carried out by four-circle diffractometer data (MoKα radiation; Siemens AED 2):CsKNaLi9{Li[SiO4]}4: tetragonally prismatic crystals, light yellow; 726 I0(hkl), R = 4.4%, Rw = 2.8%; a = 1 102.0(6), c = 637.9(5) pm; Z = 2; space group I4/m; 2 CsO0.55 + Li4TlO4 + glas (560°C, 15 d).CsKNa2Li8{Li[SiO4]}4: tetragonally prismatic crystals, light yellow; 727 I0(hkl), R = 4.4%, Rw = 2.6%; a = 1 103.5(7), c = 637.7(4) pm; Z = 2; space group I4/m; 1.1 CsO0.61 + 1.1 KO0.55 + 1.4 NaO0.52 + 6.5 Li2O + 4 SiO2 (600°C, 60 d).RbNa3Li8{Li[SiO4]}4: tetragonally prismatic crystals, colourless; 600 I0(hkl), R = 2.3%, Rw = 2.0%; a = 1 092.08(6), c = 632.76(4) pm; Z = 2; space group I4/m; 4 RbO0.57 + 3 NaO0.52 + 6.5 Li2O + 4 SiO2 (650°C, 63 d).RbNaLi4{Li[SiO4]}2: monoclinic, ball-shaped, colourless; 1 224 I0(hkl), R = 3.1%, Rw = 3.1%; a = 1 573.10(13), b = 630.48(5), c = 781.25(8) pm, b = 90.566(8)°; Z = 4; space group C2/m; 1.1 RbO0.52 + 1.2 NaO0.45 + 5 Li2O + 4 SiO2 (700°C, 40 d).
    Notes: Einkristalle der neuen Silicate CsKNaLi9{Li[SiO4]}4, CsKNa2Li8{Li[SiO4]}4, RbNa3Li8{Li[SiO4]}4 und RbNaLi4{Li[SiO4]}2, sowie Pulver der Rb-haltigen Verbindungen wurden dargstellt. Die Proben entstanden durch Tempern inniger Gemenge binärer Oxide in geschlossenen Ni- bzw. Ag-Bömbchen. Die Strukturaufklärung erfolgte jeweils durch Vierkreisdiffraktometerdaten (MoKα-Strahlung; Siemens AED 2):CsKNaLi9{Li[SiO4]}4: tetragonale Prismen, hellgelb; 726 I0(hkl), R = 4,4%, Rw = 2,8%; a = 1 102,0(6), c = 637,9(5) pm; Z = 2; Raumgruppe I4/m; 2 CsO0,55 + LiTlO4 + Duran-Glas (560°C, 15 d).CsKNa2Li8{Li[SiO4]}4: tetragonale Prismen, hellgelb; 727 I0(hkl), R = 4,4%, Rw = 2,6%; a = 1 103,5(7), c = 637,7(4) pm; Z = 2; Raumgruppe I4/m; 1,1 CsO0,61 + 1,1 KO0,55 + 1,4 NaO0,52 + 6,5 Li2O + 4 SiO2 (600°C, 60 d).RbNa3Li8{Li[SiO4]}4: tetragonale Prismen, farblos; 600 I0(hkl), R = 2,3%, Rw = 2,0%; a = 1 092,08(6), c = 632,76(4) pm; Z = 2; Raumgruppe I4/m; 4 RbO0,57 + 3 NaO0,52 + 6,5 Li2O + 4 SiO2 (650°C, 63 d).RbNaLi4{Li[SiO4]}2: monoklin, kugelförmig, farblos; 1 224 I0(hkl), R = 3,1%, Rw = 3,1%; a = 1 573,10(13), b = 630,48(5), c = 781,25(8) pm, b = 90,566(8)°; Z = 4; Raumgruppe C2/m; 1,1 RbO0,52 + 1,2 NaO0,45 + 5 Li2O + 4 SiO2 (700°C, 40 d)
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  • 146
    ISSN: 0044-2313
    Keywords: Rare Earth Elements ; Halides ; Clusters ; Cesium Scandium Chloride Carbide ; Cesium Praseodymium Iodide Dicarbide ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cs4[Sc6C]Cl13 and Cs4[Pr6(C2)]I13  -  Two Examples for the Missing Link in the Connectivity of [M6Z]X12iX6a Building UnitsCs4[Sc6C]Cl13 (tetragonal, I41/amd, a = 1 540.5(4), c = 1 017.9(7) pm, c/a = 0.661, Z = 4, R = 0.038, Rw = 0.026) and Cs4[Pr6(C2)]I13 (a = 1 804.9(3), c = 1 259.5(3) pm, c/a = 0.698, R = 0.106, Rw = 0.068) are obtained as green-black and blue-black single crystals with brass-like metallic lustre through metallothermic reduction of ScCl3 and PrI3, respectively, with cesium in the presence of carbon in sealed tantalum containers. The, overall, isotypic compounds contain isolated [Sc6C] and [Pr6(C2)] clusters, respectively, that are surrounded by 18 halide (X) ligands (12 Xi and 6 Xa; X = Cl or I). The connection is carried out via the motif [M6Z]X8iX4/21-aX4/2a-1X2/2a-a (M = Sc and Pr; Z = C and C2, respectively) and is thereby the missing link of the motifs of connection for the composition Ax[M6Z]X13. Analogous interconnection of [TiO6] octahedra is found in the anatase-type of structure of TiO2.
    Notes: Cs4[Sc6C]Cl13 (tetragonal, I41/amd; a = 1 540,5(4); c = 1 017,9(7) pm; c/a = 0,661; Z = 4; R = 0,038; Rw = 0,026 und Cs4[Pr6(C2)]I13 (a = 1 804,9(3); c = 1 259,5(3) pm; c/a = 0,698; R = 0,106; Rw = 0,068) werden bei der metallothermischen Reduktion von ScCl3 bzw. PrI3 mit Caesium in Gegenwart von Kohlenstoff in verschweißten Tantalampullen in Form von grünschwarzen bzw. blauschwarzen, messingglänzenden Einkristallen erhalten. Die weitgehend isotypen Kristallstrukturen enthalten isolierte [Sc6C]- bzw. [Pr6(C2)]-Cluster, die von 18 Halogenid-Ionen (X-, 12 Xi und 6 Xa; X = Cl bzw. I) umgeben sind. Die Verknüpfung erfolgt gemäß dem Motiv [M6Z]X8iX4/21-aX4/2a-1X2/2a-a (M = Sc bzw. Pr; Z = C bzw. C2) und stellt damit ein noch unbekanntes Verknüpfungsmuster für Verbindungen der Zusammensetzung Ax[M6Z]X13 dar, das jenem der [TiO6]-Oktaeder in der Anatas-Struktur von TiO2 entspricht.
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  • 147
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1527-1531 
    ISSN: 0044-2313
    Keywords: Terbium Cluster ; [Tb10(C2)2] ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cs3[Tb10(C2)2]Cl21, A New Formula and Structure Type with Isolated Dimeric ClustersCs3[Tb10(C2)2]Cl21 is obtained via the metallothermic reduction of TbCl3 with caesium in the presence of graphite as black single crystals. The crystal structure (monoclinic, C2/c, Z = 4; a = 2318.72(13); b = 1245.8(9); c = 1502.0(13) pm; β = 98.13(6)°; R = 0.089; Rw = 0.049) contains dimeric clusters that are built from two octahedra connected via one common edge and filled with C2 units. These isolated [Tb10(C2)2] clusters are surrounded by 26 chloride ligands which are then connected via i - a and a - a bridges in a way that voids for Cs+ of coordination number 10 are formed.
    Notes: Cs3[Tb10(C2)2]Cl21 entsteht bei der metallothermischen Reduktion von TbCl3 mit Caesium in Gegenwart von Graphit in Form schwarzer Einkristalle. Die Kristallstruktur (monoklin, C2/c, z = 4; a = 2318,72(13); b = 1245,8(9); c = 1502,0(13) pm; β = 98,13(6)°; R = 0,089; Rw = 0,049) enthält dimere Cluster, die aus zwei über eine gemeinsame Kante verknüpften und durch zwei C2-Hanteln aufgefüllten Oktaedern gebildet werden. Die isolierten [Tb10(C2)2]-Cluster sind von insgesamt 26 Cl- umgeben und durch i - a- bzw. a - a-Brücken so miteinander verknüpft, daß für die Cs+ Lücken der Koordinationszahl 10 verbleiben.
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  • 148
    ISSN: 0044-2313
    Keywords: Silver(I) di(organosulfonyl)-amides ; silver(I)-η2-phenyl interaction ; silver-silver interaction ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polysulfonyl Amines. LVII. Two Silver(I) Di(organosulfonyl)-amides with Silver-η2-Aryl or Silver-Silver Interactions: Crystal Structures of Silver Di(benzenesulfonyl)amide-Water (1/0.5) and of Anhydrous Silver Di(4-toluenesulfonyl)-amideCrystals of [(PhSO2)2NAg(μ-H2O)AgN(SO2Ph)2]n (5) and [(4-Me—C6H4SO2)2NAgAgN(SO2C6H4-4-Me)2]n (6) were obtained from aqueous solutions. The crystallographic data are for 5 (at -95°C): monoclinic, space group C2/c, a = 2 743.8(5), b = 600.49(12), c = 1 664.5(3) pm, β = 101.143(15)°, V = 2.6908 nm3, Z = 8, Dx = 2.040 Mg m-3; for 6 (at -130°C): monoclinic, space group P21/n, a = 1 099.8(5), b = 563.7(3), c = 2 487.7(13) pm, β = 99.68(4)°, V = 1.5203 nm3, Z = 4, Dx = 1.888 Mg m-3. In both crystals, the silver atom has a fivefold coordination. The structure of 5 displays [(RSO2)2N—Ag(μ-H2O)Ag′—N(SO2R)2] units with Ag—N 226.9 pm, Ag—O 236.7 pm and Ag—O—Ag′ 95.3°; the water oxygen lies on a crystallographic twofold axis. These units are extended to two fused six-membered rings by intramolecular dative bonds (S)O → Ag′ and S(O)′ → Ag (249.3 pm). One phenyl group from each (PhSO2)2N moiety is η2-coordinated with its p-C and one m-C atom to a silver atom of a neighbouring bicyclic unit related by a glide plane to form infinite parallel strands (p-C—Ag 252.2, m-C—Ag 263.9 pm). The strands are interconnected into parallel layers through hydrogen bonds between H2O and sulfonyl oxygens [O … O(S) 276.1 pm]. These layers consist of a hydrophilic inner region containing metal ions, N(SO2)2 fragments and water molecules, and hydrophobic surfaces formed by phenyl groups. The structure of 6 features centrosymmetric [(RSO2)2N—Ag—Ag′—N(SO2R)2] units with two intramolecular dative bonds (S)O → Ag′ and (S)O′ → Ag (Ag—Ag′ 295.4, Ag—N 226.0, Ag—O 229.4 pm). These bi-pentacyclic units are associated by translation parallel to y into infinite strands by two dative (S)O → Ag bonds per silver atom (Ag—O 243.2 and 253.3 pm).
    Notes: Kristalle von [(PhSO2)2NAg(μ-H2O)AgN(SO2Ph)2]n (5) und [(4-Me—C6H4SO2)2NAgAgN(SO2C6H4-4-Me)2]n (6) wurden aus Wasser erhalten. Die kristallographischen Daten sind für 5 (bei -95°C): monoklin, Raumgruppe C2/c, a = 2 743,8(5), b = 600,49(12), c = 1 664,5(3) pm, β = 101,143(15)°, V = 2,6908 nm3, Z = 8, Dx = 2,040 Mg m-3; für 6 (bei -130°C): monoklin, Raumgruppe P21/n, a = 1 099,8(5), b = 563,7(3), c = 2 487,7(13) pm, β = 99,68(4)°, V = 1,5203 nm3, Z = 4, Dx = 1,888 Mg m-3. Das Silberatom ist in beiden Verbindungen pentakoordiniert. Die Struktur von 5 enthält Einheiten des Typs [(RSO2)2N—Ag(μ-H2O)Ag′—N(SO2R)2] mit Ag—N 226,9 pm, Ag—O 236,7 pm und Ag—O—Ag′ 95,3°; das Wasser-O-Atom liegt auf einer kristallographischen zweizähligen Achse. Durch intramolekulare dative Bindungen (S)O → Ag′ und S(O)′ → Ag (249,3 pm) entstehen zwei kondensierte Sechsringe. Ein Phenylring aus jeder (PhSO2)2N-Gruppe geht mit dem p-C- und einem m-C-Atom eine η2-Wechselwirkung mit einem Ag-Atom eines benachbarten Bicyclus ein (p-C—Ag 252,2, m-C—Ag 263,9 pm). Auf diese Weise bilden sich unendliche parallele Stränge, in welchen die obigen Repetiereinheiten über eine Gleitspiegelebene miteinander in Beziehung stehen. Die Stränge sind durch Wasserstoffbrücken zwischen H2O und Sulfonyl-O-Atomen [O … O(S) 276,1 pm] zu parallelen Schichten verknüpft. Diese besitzen einen hydrophilen inneren Bereich aus Metallkationen, N(SO2)2-Fragmenten und Wassermolekülen und hydrophobe, von Phenylgruppen gebildete Oberflächen. Die Struktur von 6 enthält zentrosymmetrische [(RSO2)2N—Ag—Ag′—N(SO2R)2]-Einheiten mit zwei intramolekularen dativen Bindungen (S)O → Ag′ und (S)O′ → Ag (Ag—Ag 295,4, Ag—N 226,0, Ag—O 229,4 pm). Diese bipentacyclischen Einheiten sind über zwei dative (S)O → Ag-Bindungen pro Silberatom (Ag—O 243,2 und 253,3 pm) zu unendlichen Strängen parallel zur y-Achse assoziiert. Innerhalb des Stranges stehen sie durch Translation miteinander in Beziehung.
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  • 149
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1532-1536 
    ISSN: 0044-2313
    Keywords: Erbium Clusters, [Er10(C2)2] ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cs[Er10(C2)2]I18 and [Er10(C2)2]Br18: Two New Examples for Reduced Halides of the Lanthanides with Isolated [M10(C2)2] ClustersCs[Er10(C2)2]I18 is obtained from the reaction of ErI3 with caesium and carbon in sealed tantalum containers at 700°C and [Er10(C2)2]Br18 through the metallothermic reduction of ErBr3 with rubidium in the presence of carbon at 750°C in sealed niobium containers. The crystal structures {Cs[Er10(C2)2]I18: triclinic, P1; a = 1 105.2(8) pm, b = 1 112.0(7) pm; c = 1 122.9(8) pm; α = 66.91(3)°, β = 87.14(3)°; γ = 60.80(3)°; Z = 1; R = 0.049, Rw = 0.043; [Er10(C2)2]Br18: monoclinic, P21/n, a = 971.8(6) pm, b = 1 623.4(9) pm, c = 1 163.8(6) pm, β = 104.00(6)°; Z = 2; R = 0.077, Rw = 0.057} contain isolated dimeric [Er10(C2)2] clusters. Due to the inclusion of C2 units, the octahedra are elongated in the direction of the pseudo C4 axis. The connecting edges of the two octahedra are exceptionally short (316.7 pm and 314.8 pm respectively). The dimeric units are connected via Xi-a and Xa-i (X = Br, I) bridges according to [Er10(C2)2X10iX8/2i-a]X8/2a-i. Cs+ is surrounded by a cuboctahedron of iodide ions in Cs[Er10(C2)2]I18.
    Notes: Cs[Er10(C2)2]I18 entsteht bei der Umsetzung von Erl3 mit Caesium und Kohlenstoff in verschweißten Tantalampullen bei 700°C, [Er10(C2)2]Br18 bei der metallothermischen Reduktion von ErBr3 mit Rubidium in Gegenwart von Kohlenstoff bei 750°C in verschweißten Niobampullen. Die Kristallstrukturen {Cs[Er10(C2)2]I18: triklin, P1; a = 1 105,2(8) pm; b = 1 112,0(7) pm; c = 1 122,9(7) pm; α = 66,91(3)°; β = 87,14(3)°; γ = 60,80(3)°; Z = 1; R = 0,049, Rw = 0,043; [Er10(C2)2]Br18: monoklin, P21/n; a = 971,8(6); b = 1 623,4(9); c = 1 163,8(6); β = 104,00(6)°; Z = 2; R = 0,077, Rw = 0,057} beinhalten isolierte dimere [Er10(C2)2]-Cluster. Wegen des Einbaus der C2-Hantel sind die Oktaeder entlang ihrer pseudovierzähligen Achse gestreckt. Die verknüpfenden Oktaederkanten weisen einen besonders kurzen Metall-Metall-Abstand auf (316,7 bzw. 314,8 pm). Die dimeren Einheiten sind über Xi-a bzw. Xa-i-Brücken (X = Br, I) miteinander verknüpft, gemäß [Er10(C2)2X10iX8/2i-a]X8/2a-i. Cs+ ist in Cs[Er10(C2)2]I18 kuboktaederisch von Iodidionen umgeben.
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  • 150
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1537-1542 
    ISSN: 0044-2313
    Keywords: Manganese chlorides ; lithium chlorides ; neutron and X-ray diffraction ; spinel-type chlorides ; fast ionic conductivity ; vacancies ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure and Electric Conductivity of Spinel-Type Li2-2xMn1+xCl4 Solid SolutionsThe electric conductivity of the fast lithium ion conductors Li2-2xMn1+xCl4 was measured by impedance spectroscopic methods. The conductivities obtained, e.g. ∼ 4 × 10-1 Ω-2 cm-1 at 570 K, depend only little on the lithium content. The crystal structure of Li1.6Mn1.2Cl4 was determined by neutron powder and X-ray single crystal diffraction (space group Fd3m, Z = 8, a = 1 049.39(6) pm, Rw = 1.4% on the basis of 170 reflections). The lithium deficient chloride crystallizes in an inverse spinel structure like the stoichiometric compound Li2MnCl4 according to the formula (Li0,8)[Li0,4Mn0,6]2Cl4 with vacancies () at the tetrahedral sites. The decrease of the Moct—Cl distances with the increase of x reveals that the ionic radius of Mn2+ in chlorides is equal or even smaller than that of Li+ opposite to fluorides and oxides. The —Cl distances of spinel type chlorides are 237 (tet) and 274 pm (oct), respectively. The mechanism of the ionic conductivity is discussed.
    Notes: Die elektrische Leitfähigkeit von schnellen Lithium-Ionenleitern des Typs Li2-2xMn1+xCl4 wurde mit Hilfe der Impedanz-Spektroskopie bestimmt. Sie beträgt ca. 4 × 10-2 Ω-1 cm-1 bei 300°C und ist weitgehend unabhängig vom Lithiumgehalt. Die Kristallstruktur von Li1,6Mn1,2Cl4 wurde mittels Neutronenpulver- und Röntgeneinkristall-Messungen (Raumgruppe Fd3m, Z = 8, a = 1 049,39(6) pm, Rw = 1,4% auf der Basis von 170 Reflexen) ermittelt. Das lithiumdefiziente Chlorid kristallisiert wie Li2MnCl4 selbst in einer inversen Spinell-Struktur entsprechend (Li0,8)[Li0,4Mn0,6]2Cl4 mit Leerstellen () auf den Tetraederplätzen. Aus der Abnahme der Abstände Moct—Cl mit zunehmendem x folgt, daß der Ionenradius von Mn2+ in Chloriden im Gegensatz zu analogen Fluoriden und Oxiden gleich oder kleiner ist als der von Li+. Die —Cl-Abstände in Spinell-typ-Chloride betragen 237 (tet) und 274 pm (oct). Der Mechanismus der Ionen-Leitfähigkeit wird diskutiert.
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  • 151
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1559-1564 
    ISSN: 0044-2313
    Keywords: Iodobismutate ; BiI3 ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of [Li(thf)4]2[Bi4I14(thf)2], [Li(thf)4]4[Bi5I19], and (Ph4P)4[Bi6I22]Solutions of BiI3 in THF or methanol react with MI (M = Li, Na) to form polynuclear iodo complexes of bismuth. The syntheses and results of X-ray structure analyses of compounds [Li(thf)4]2[Bi4I14(thf)2], [Li(thf)4]4[Bi5I19], [Na(thf)6]4[Bi6I22] and (Ph4P)4[Bi6I22] are described. The anions of these compounds consist of edge-sharing BiI6 and BiI5(thf) octahedra. The Bi atoms lie in a plane and are coordinated by bridging and terminal I atoms and by THF ligands in a distorted octahedral fashion.[Li(thf)4]2[Bi4I14(thf)2]: Space group P1 (No. 2), a = 1 159.9(6), b = 1 364.6(7), c = 1 426.5(7) pm, α = 114.05(3), β = 90.01(3), γ = 100.62(3)°.[Li(thf)4]4[Bi5I19]: Space group P21/n (No. 14), a = 1 653.0(9), b = 4 350(4), c = 1 836.3(13) pm, β = 114.70(4)°.[Na(thf)6]4[Bi6I22]: Space group P21/n (No. 14), a = 1 636.4(3), b = 2 926.7(7), c = 1 845.8(4) pm, β = 111.42(2)°.(Ph4P)4[Bi6I22]: Space group P1 (No. 2), a = 1 368.6(7), b = 1 508.1(9), c = 1 684.9(8) pm, α = 98.28(4), β = 95.13(4), γ = 109.48(4)°.
    Notes: Lösungen von BiI3 in THF oder Methanol reagieren mit MI (M = Li, Na) zu mehrkernigen Bismutiodokomplexen. Darstellung und Ergebnisse der Kristallstrukturanalyse von [Li(thf)4]2[Bi4I14(thf)2], [Li(thf)4]4[Bi5I19], [Na(thf)6]4[Bi6I22] und (Ph4P)4[Bi6I22] werden beschrieben. Die Anionen der vier Verbindungen bestehen aus kantenverknüpften BiI6- bzw. BiI5(thf)-Oktaedern. In diesen Verbindungen liegen die Bi-Atome in einer Ebene und werden verzerrt oktaedrisch von den verbrückenden und terminalen I-Atomen bzw. THF-Liganden koordiniert.[Li(thf)4]2[Bi4I14(thf)2]: Raumgruppe P1 (Nr. 2), a = 1 159,9(6), b = 1 364,6(7), c = 1 426,5(7) pm, α = 114,05(3), β = 90,01(3), γ = 100,62(3)°.[Li(thf)4]4[Bi5I19]: Raumgruppe P21/n (Nr. 14), a = 1 653,0(9), b = 4 350(4), c = 1 836,3(13) pm, β = 114,70(4)°.[Na(thf)6]4[Bi6I22]: Raumgruppe P21/n (Nr. 14), a = 1 636,4(3), b = 2 926,7(7), c = 1 845,8(4) pm, β = 111,42(2)°.(Ph4P)4[Bi6I22]: Raumgruppe P1 (Nr. 2), a = 1 368,6(7), b = 1 508,1(9), c = 1 684,9(8) pm, α = 98,28(4), β = 95,13(4), γ = 109,48(4)°.
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  • 152
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1565-1568 
    ISSN: 0044-2313
    Keywords: Strontium, sodium, nickel, oxide ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Another Alkaline Alkaline-Earth Oxoniccolate of Perovskite Type Structure: Sr12NaNi7O23Single Crystals of Sr12NaNi7O23 were prepared in closed system by Na2O2 flux reaction. X-ray single crystal work show hexagonal symmetry, space group D32-P321, a = 9.429, c = 7.896 Å, Z = 1. Sr12NaNi7O23 is strongly related to the stackered perovskites containing consequently face shared Ni2O9 double octahedra and Na+ inside a trigonal prismatic coordination by oxygen. One underoccupied oxygen point position decreases the coordination number of one Ni3+ of the Ni2O9 groups and a second surrounded by trigonal prisms to corner connected Ni2O7 double tetrahedra. The crystal chemistry will be discussed with respect to compounds of the same structure.
    Notes: Einkristalle von Sr12NaNi7O23 wurden im geschlossenen System mit Na2O2 als Schmelzmittel dargestellt. Röntgenographische Untersuchungen zeigen hexagonale Symmetrie, Raumgruppe D32-P321; a = 9,429; c = 7,896 Å, Z = 1. Sr12NaNi7O23 ist eng mit den Stapelvarianten der Perowskite verwandt und zeigt flächenverknüpfte Ni2O9-Oktaederdoppel sowie Na+ in einer trigonal prismatischen Koordination von Sauerstoff. Eine unterbesetzte Sauerstofflage erniedrigt die Koordinationszahl von einem Ni3+-Ion in den Ni2O9-Gruppen und von einem weiteren in trigonal prismatischer Koordination. Es entstehen eckenverknüpfte Ni2O7- Doppeltetraeder. Die Kristallchemie wird mit Blick auf Verbindungen vom gleichen Strukturtyp diskutiert.
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  • 153
    ISSN: 0044-2313
    Keywords: Chromium(III)Sulfate ; Chemical Transport ; Thermodynamical calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions on the Thermal Behaviour of Sulfates. XIII. The Chemical Vapour Transport of Cr2(SO4)3 with Cl2 and with HCl. Experiments and CalculationsWell shaped crystals (cubical or rectangular parallel-epiped respectively, edge length up to 1 mm) of rhombohedral Cr2(SO4)3 can be grown in the less hot zone of a closed silica ampoule by means of CVT using Cl2 or HCl as transport agents in endothermal transport reactions. The influence of the mean transport temperature as well as the concentration of the transport agents on the deposition rates was investigated.On the basis of thermochemical calculations an explanation of the transport mechanism is given in the present paper.
    Notes: Gut ausgebildete Kristalle (würfel- bzw. quaderförmig; Kantenlänge bis ca. 1 mm) von rhomboedrischem Cr2(SO4)3 wurden mit Cl2 oder HCl als Transportmittel (z. B. 690 → 630°C) auf der weniger heißen Seite einer Quarzglasampulle abgeschieden. Mit beiden Transportmitteln können hohe Transportleistungen (z. B. 78 mg/h) erzielt werden. Es wurde der Einfluß der Temperatur sowie der Transportmittelkonzentration (Zusatz von PtCl2) auf die Abscheidungsraten untersucht.Auf der Basis thermodynamischer Modellrechnungen wird eine Interpretation des beobachteten, auf endotherme Reaktionen zurückzuführenden Transportverhaltens gegeben.
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  • 154
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1578-1582 
    ISSN: 0044-2313
    Keywords: Copper, tin, borate, oxide ; synthesis ; crystal structure ; X-ray diffraction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On a New Copper Tin Borate Oxide with Isolated BO3 Units: Cu5Sn(BO3)2O4Single Crystals of the new compound Cu5Sn(BO3)2O4 were obtained by a B2O3 fluxtechnique. They crystallize in a monoclinic distorted variant of a Ludwigite structure with a partly ordered metal distribution. X-ray investigations on single crystals led to the space group C2h5-P21/c (No. 14); a = 6.3526(7); b = 9.502(1); c = 12.100(9) Å; β = 93.30(3)°; Z = 4. All metal-sites are distorted octahedraly coordinated by oxygen-ions. The structure contains BO3-units and oxygen which is not coordinated to boron.
    Notes: Aus einer B2O3-Schmelze gelang die Synthese von Einkristallen der Substanz Cu5Sn(BO3)2O4, die in einer monoklin verzerrten Strukturvariante eines Ludwigites mit weitgehend geordneter Metallverteilung kristallisiert. Röntgenographische Untersuchungen an Einkristallen ergeben die Raumgruppe C2h5-P21/c (Nr. 14); a = 6,3526(7); b = 9,502(1); c = 12,100(9) Å; β = 93,30(3)°; Z = 4. Die Metallkationen sind verzerrt oktaedrisch von Sauerstoffionen koordiniert. Die Struktur weist sowohl isolierte, planare BO3-Baugruppen als auch nicht an Bor gebundenen Sauerstoff auf.
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  • 155
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1583-1588 
    ISSN: 0044-2313
    Keywords: Copper, titanium, borate, pyroborate, oxide, synthesis ; crystal structure, X-ray diffraction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of Cu9Ti2[B2O5]2[BO3]2O6  -  a Copper Titanium Borate Pyroborate Oxide?The new compound Cu9Ti2[B2O5]2[BO3]2O6 was prepared by a B2O3 flux-technique and crystallizes in a triclinic and completely novel structure type. X-ray investigations on single crystals led to the space group Ci1-P1 (Nr. 2); a = 7.246(4) Å; b = 10.637(5) Å; c = 11.436(6) Å; α = 104.53(5)°; β = 96.25(4)°; γ = 90.36(3)°; Z = 2. The metal distribution is ordered. TiIV-sites are distorted octahedraly coordinated by oxygen-ions. The copper oxygen polyhedra are distorted square planar or pyramidal respectively. The structure contains isolated planar BO3-units, nearly planar pyroborate groups and oxygen which is not coordinated to boron.
    Notes: Aus einer B2O3-Schmelze gelang die Synthese der Substanz Cu9Ti2[B2O5]2[BO3]2O6, die in einem völlig neuartigen Strukturtyp kristallisiert. Röntgenographische Untersuchungen an Einkristallen ergeben die Raumgruppe Ci1-P1 (Nr. 2); a = 7,246(4) Å; b = 10,637(5) Å; c = 11,436(6) Å; α = 104,53(5)°; β = 96,25(4)°; γ = 90,36(3)°; Z = 2. Kupfer und Titan sind geordnet verteilt. Die Koordination von TiIV ist leicht verzerrt oktaedrisch, die von CuII ist verzerrt quadratisch planar bzw. verzerrt quadratisch pyramidal. Die Struktur weist sowohl isolierte, planare BO3-Baueinheiten, nahezu planare Pyroborat-Baugruppen und nicht an Bor gebundenen Sauerstoff auf.
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  • 156
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1599-1600 
    ISSN: 0044-2313
    Keywords: Esters of N-acetyl dithiocarbamic acid ; mass spectra ; electron absorption spectra ; infrared spectra ; nuclear magnetic resonance spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Chalcogenolates. 205. Reaction of Acetamide with Carbon Disulfide. 2. Esters of N-Acetyl Dithiocarbamic AcidThe prepared yellow esters of N-acetyl dithiocarbamic acid H3C—CO—NH—CS—SR with R = CH3, C2H5 have been characterized by means of mass, electron absorption, infrared, and nuclear magnetic resonance spectra.
    Notes: Die hellgelben Ester der N-Acetyldithiocarbamidsäure H3C—CO—NH—CS—SR mit R = CH3, C2H5 wurden mit Massen-, Elektronenabsorptions-, Infrarot- und Kernresonanzspektren charakterisiert.
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  • 157
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1619-1626 
    ISSN: 0044-2313
    Keywords: C—H acidic aluminium organyls ; deprotonation of bis(trimethylsilyl)methyl groups ; AlC2Si heterocycles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Molecular Structure of Two 1-Sila-3-alanata-cyclobutane Derivatives with Four-membered AlC2Si-HeterocyclesThe C—H acidic bis(trimethylsilyl)methyl compounds Me3C—AlR2 und Me3C—CH2—AlR2 (R — CH(SiMe3)2) are deprotonated by treatment with the sterically high shielded base LiCH(SiMe3)2 in the presence of 1,3,5-trimethylhexahydrotriazinane. The deprotonation occurs at a methyl group of one of the element-organic substituents, and the formed carbanions are stabilized by coordination to the unsaturated Al atoms yielding four-membered heterocycles. Both products were characterized by a crystal structure determination each showing bent ring systems.
    Notes: Die C—H-aciden Bis(trimethylsilyl)methyl-Verbindungen Me3C—AlR2 und Me3C—CH2—AlR2 (R — CH(SiMe3)2) reagieren mit der sterisch sehr hoch abgeschirmten Base LiCH(SiMe3)2 in Gegenwart von 1,3,5-Trimethylhexahydrotriazinan unter Deprotonierung einer Methylgruppe des elementorganischen Substituenten; die dabei gebildeten Carbanionen stabilisieren sich durch eine Wechselwirkung zu dem koordinativ ungesättigten Al-Atom unter Ausbildung von viergliedrigen AlC2Si-Heterozyklen. Beide Produkte wurden durch eine Kristallstrukturbestimmung charakterisiert, die jeweils ein nicht-planares Ringsystem ergab.
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  • 158
    ISSN: 0044-2313
    Keywords: Polyolato-copper complex ; Deprotonated methyl β-D-xylopyranoside ; Crystal structure ; Hydrogen bond structure ; Homodromic helix ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polyol Metal Complexes. VIII. R,R-trans-Diaminocyclohexane-κN,N′ Methyl-β-D-xylopyranosid-2,3-ato-κO2,O3 Aqua Copper Dihydrate, [(R,R-chxn)(H2O)Cu(Me-β-D-Xylp2,3 H-2)] · 2 H2O,  -  a Copper Complex with a Twofold Deprotonated Xylose Derivative as a LigandMethyl β-D-xylopyranoside forms a chelate complex with copper(II) ions in aqueous, alkaline solution after deprotonation at O-2 and O-3. In the blue crystals, CuII is further coordinated by R,R-trans-1,2-diaminocyclohexane and water; P21, a = 982.9(3), b = 705.8(5), c = 1 292.1(6) pm, β = 96.74(4)°, V = 890.2(8) · 106 pm3. The alkoxide-O-atoms act as acceptors in a hydrogen bond system, a typical feature of which is a homodromic helix of water molecules.
    Notes: Methyl-β-D-xylopyranosid bildet in wäßrig-alkalischer Lösung einen Chelatkomplex mit Kupfer(II), in dem es an O-2 und O-3 deprotoniert als Diolat-Ligand vorliegt. In den blauen Kristallen ist CuII außerdem von R,R-trans-1,2-Diaminocyclohexan und Wasser koordiniert; P21, a = 982,9(3), b = 705,8(5), c = 1 292,1(6) pm, β = 96,74(4)°, V = 890,2(8) · 106 pm3. Die Alkoxid-O-Atome sind Akzeptoren in einem Wasserstoffbrückenbindungssystem, dessen auffälliges Merkmal eine homodrome Schraube von Wassermolekülen ist.
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  • 159
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1635-1644 
    ISSN: 0044-2313
    Keywords: Vanadium(V) complexes ; trivalent, pentadentate Schiff base ligands ; X-ray structure determination ; UV/VIS, IR, Raman, 1H-, 13C-, and 51V-NMR spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structural and Spectroscopic Characterization of Six-Coordinate Vanadium(V) Complexes: A Structural Model for the Active Site of Vanadium-Dependent HaloperoxidasesA series of vanadium(V) complexes has been synthesized from ammonium metavanadate and trivalent, pentadentate Schiff base ligands. These aliphatic as well as aromatic hydroxyl groups containing ligands are stabilizing the VO3+ unit. The complexes 1-5 are characterized by 1H-, 13C- and 51V-NMR, virbrational (IR, Raman and resonance Raman) and electronic spectroscopy as well as EHMO calculations. The X-ray crystal structure analysis of 1 (monoclinic space group P21/n: a = 1 073.3(2); b = 1 201.1(3); c = 1 165.7(3) pm; β = 101.89(2)°; Z = 4) shows that the vanadium(V) center has a distorded octahedral environment. The LMCT transition of the complexes 1-5 in the electronic spectra has been observed at comparatively high energies (21.8 - 25.8 × 103 cm-1) and are assigned based on resonance Raman spectra and EHMO calculations. The implications of the observed physical properties of the complexes 1-5 to the structural model proposed for the active site of vanadat(V)-dependent haloperoxidases are discussed.
    Notes: Ausgehend von Ammoniummetavanadat und dreibasigen, fünfzähnigen Liganden vom Typ der Schiffschen Basen wurde eine Reihe unterschiedlich substituierter Vanadium(V)-Komplexe synthetisiert. Das sowohl aliphatische als auch aromatische Hydroxylgruppen tragende Ligandengerüst stabilisiert hierbei die VO3+-Einheit. Die Charakterisierung der Komplexe 1-5 erfolgt mit Hilfe von 1H-, 13C- und 51V-NMR-bzw. Schwingungsspektroskopie (IR, Raman und Resonanz-Raman) sowie durch die Aufnahme von Elektronenanregungsspektren. Die Röntgenstrukturanalyse von 1 (monokline Raumgruppe P21/n: a = 1 073,3(2); b = 1 201,1(3); c = 1 165,7(3) pm; β = 101,89(2)°; Z = 4) zeigt für das Vanadium(V)-Zentrum eine verzerrt oktaedrische Umgebung. Der LMCT-Übergang in den Elektronenspektren der Komplexe 1-5, dessen Zuordnung auf Resonanz-Raman-Spektren und EHMO-Rechnungen basiert, wird bei relativ großen Energien (21,8-25,8 × 103 cm-1) beobachtet. Die physikalischen Eigenschaften der Komplexe 1-5 werden im Zusammenhang mit den entsprechenden von Strukturmodellen für das aktive Zentrum der Vanadium-abhängigen Haloperoxidasen diskutiert.
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  • 160
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1925-1931 
    ISSN: 0044-2313
    Keywords: Phosphorus compounds ; 3-Iod-5-alkyl-2,6,7-trichalcogena-1,3,4,5-tetraphospha-bicyclo[2.2.1.] heptan ; 3-Iod-6-alkyl-2,5,7-trichalcogena-1,3,4,6-tetra-phospha-bicyclo-[2.2.1.] heptan ; 3-Alkyl (Iod)-3,5,7-trithia-1,2,4,6-tetraphosphatricyclo[2.2.1.02,6] heptan ; 31P-NMR ; 77Se-NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Tetraphosphorus Trichalcogenides with Alkyl IodidesReactions of alkyl iodides RI (R = CHI2, CH2I or tert-Butyl) with P4E3 (E = S or Se) under the influence of light resulted in cleavage of the basal P3 ring. β-P4E3(I)R was formed initially, then it rearranged to the more stable α-P4E3(I)R structure. 31P NMR data of these products were measured and discussed, along with 77Se data for α- and β-P477SeSe2(I)CHI2. On reaction of P4S3 with tert-butyl iodide in CS2 or with sec-butyl iodide or iso-propyl iodide in dioxane, the new type of compounds P5S2R was observed. In this a sulfur bridge of P4S3 is replaced by a P—R group. 31P-NMR data for these compounds are reported.
    Notes: Bei der Reaktion von Alkyliodiden RI (R = CHI2, CH2I und tert-Butyl) mit P4E3 (E = S; Se) in CS2 wird unter Lichteinwirkung eine Bindung des basalen P3-Ring gebrochen. Es bildet sich β-P4E3(I)R, das sich nach einiger Zeit in das stabilere α-P4E3(I)R umwandelt. Die 31P-NMR Daten dieser Verbindungen und zusätzlich die 77Se-Daten für α- und β-P477SeSe2(I)CHI2 wurden gemessen und diskutiert. Bei der Reaktion von P4S3 mit tert-Butyliodid in CS2 bzw. mit sec-Butyliodid oder iso-Propyliodid in Dioxan wird der neue Verbindungstyp P5S2R beobachtet, in dem eine Schwefelbrücke des P4S3 durch eine P—R-Gruppe ersetzt ist, auch seine 31P-NMR-Daten werden wiedergegeben.
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  • 161
    ISSN: 0044-2313
    Keywords: High temperature superconductors ; copper oxygen chains ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Effekt des Carbonateinbaus auf die strukturellen und supraleitenden Eigenschaften der Doppelkettenverbindung Y2Ba4Cu7O15-xStrukturelle Untersuchungen von Pulverpräparaten von Y2Ba4Cu7O15-x mit unterschiedlichem Carbonatgehalt wurden durchgeführt. Die Rietveld-Verfeinerung mit Röntgen-Pulver-Daten zeigt einen bemerkenswerten Einfluß des Carbonateinbaus auf die Gitterkonstanten. Ein auffälliger Effekt ist die Herabsetzung von Tc mit steigendem Carbonatgehalt. Wir führen diese Effekte auf einen Einbau des Carbonations in das Gitter, Fehlstellen an der Cu(1) Position und eine mögliche Fehlorientierung der einfachen Kupfer-Sauerstoffketten zurück. Eine Änderung der Struktur (z. B. Überstruktur) konnte nicht gefunden werden.
    Notes: Structural investigations on powder samples of Y2Ba4Cu7O15-x with different carbonate content have been performed. Powder x-ray Rietveld refinements showed the remarkable influence of carbonate incorporation on the lattice parameters. Most important is the decrease of Tc with increasing carbonate content. We assign these effects to an incorporation of the carbonate ion into the crystal lattice, copper vacancies at the Cu(1) position and a possible misorientation of the copper oxygen single chains. No change of the structure (e. g. superstructure) could be found.
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  • 162
    ISSN: 0044-2313
    Keywords: Phosphorus oxychloride ; fluorination ; heptafluoro diphosphate ; oxo-fluorophosphates, [OPF5]2-, [OPF4]- ; 31P-n.m.r. ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Salts of Halogenophosphoric Acids. XIX Formation and Identification of Stable Intermediates on the Reaction of Fluoride with Phosphorus OxychlorideBy reaction of POCl3 with fluorides of tertiary amines in the presence of the free amines the oxo-fluorophosphates [F2P(O—O—PF5)]-, [OPF5]2-, and [OPF4]- are formed as intermediates on the way to [PF6]-. The compounds were characterized by NMR spectroscopy.
    Notes: Bei der Reaktion von POCl3 mit Fluoriden tertiärer Ammoniumbasen in nichtwäßriger, basischer Lösung werden als Zwischenprodukte auf dem Weg zum [PF6]- das Heptafluorodiphosphat [F2P(O)—O—PF5]- sowie die Oxofluorophosphate [OPF5]2- und [OPF4]- gebildet und NMR-spektroskopisch charakterisiert.
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  • 163
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1943-1946 
    ISSN: 0044-2313
    Keywords: Ternary chlorometalates(III) ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Coordination Compounds Prepared in Acetic Acid. I. Chlorometalates(III) of Iron, Chromium, and VanadiumTernary chloride-hydrates A2MCl5 · H2O (A = Cs, Rb, (K)) can be precipitated with HCl from solutions of MCl3 · 6 H2O, (M = Fe, Cr, V) and alkali metal acetates in acetic acid. Under special conditions also compounds of the composition Cs3MCl6 · H2O can be obtained. After dehydration of the solutions with acetyl chloride, anhydrous compounds are formed: Cs3Fe2Cl9; A3CrCl6 and A3Cr2Cl9 with A = Cs, Rb; Cs3VCl6 and Cs3V2Cl9. VIII is partially oxidized to VIV by an excess of acetyl chloride. Compounds A2VCl6 with A = Cs, Rb can be obtained more conveniently by the reaction of VOCl2 · H2O in acetic acid with acetyl chloride.The lattice parameters of some compounds were determined from powder patterns in analogy to known structure families.
    Notes: Aus Lösungen der Chloridhydrate MCl3 · 6 H2O (M = Fe, Cr, V) in Eisessig lassen sich nach Zugabe von Alkalimetallacetaten mit HCl ternäre Chloridhydrate A2MCl5 · H2O (A = Cs, Rb, z. T. K), unter speziellen Bedingungen auch Verbindungen der Zusammensetzung Cs3MCl6 · H2O fällen. Werden die Ausgangslösungen mit Acetylchlorid dehydratisiert, so entstehen wasserfreie Chlorometallate(III): Cs3Fe2Cl9; A3CrCl6 und A3Cr2Cl9 mit A = Cs, Rb; Cs3VCl6 und Cs3V2Cl9. Vanadium(III) kann teilweise zu VIV oxidiert werden. Chlorovanadate A2VCl6 mit A = Cs, Rb lassen sich aber günstiger aus Lösungen von VOCl2 · 2 H2O in Eisessig mit Acetylchlorid erhalten.Von einigen strukturell noch nicht untersuchten Verbindungen sind durch Analogindizierungen von Pulveraufnahmen die Gitterparameter bestimmt worden.
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  • 164
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1947-1952 
    ISSN: 0044-2313
    Keywords: System vanadium pentoxide - niobium pentoxide ; alkoxide hydrolysis ; metastable compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation and Transformation of Oxide Phases in the Quasibinary System V2O5—Nb2O5In the quasibinary system V2O5—Nb2O5 three phases exist in addition to the boundary phases: VNbO5, V2Nb9O27.5, and VNb9O25. Only the latter phase is a thermodynamically stable one. The metastable phases VNbO5 and V2Nb9O27.5 are formed by thermal decomposition of freeze-dryed products of alkoxide hydrolysis. VNb9O25 can be formed by thermal treatment of a metastable solid solution with TT-Nb2O5 structure or, beside V2O5, by thermal decomposition of the other metastable phases. A reaction scheme of formation and decomposition of phases in the quasi- binary system is given and discussed.
    Notes: Im quasibinären System V2O5—Nb2O5 existieren zusätzlich zu den beiden Randphasen drei weitere Phasen: VNbO5, V2Nb9O27,5 und VNb9O25. Nur die letztere Phase ist thermodynamisch stabil. Die metastabilen Phasen VNbO5 und V2Nb9O27,5 entstehen durch thermische Zersetzung gefriergetrockneter Produkte von Alkoxidhydrolysen. VNb9O25 kann durch thermische Behandlung einer metastabilen festen Lösung mit der Struktur des Nb2O5 oder, neben V2O5, durch thermische Zersetzung der anderen metastabilen Phasen erhalten werden. Ein Reaktionsschema der Phasenbildung und -Zersetzung im quasibinären System wird angegeben und diskutiert.
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  • 165
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1953-1964 
    ISSN: 0044-2313
    Keywords: Chromium oxyiodides ; chemical vapor transport ; model calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Chemical Transport of Cr2O3 with CrI3/I2 - Experiments and Model-Calculations for Participation of CrOI2,gGaseous chromium oxyiodides that were unknown up to now cause the migration of Cr2O3 in the temperature gradient 1 000°C→900°C when iodine (e. g. 0.1 mmol/ml) and CrI3 is added (eq. (1)). Transport agent for Cr2O3 is gaseous CrI4. With a smaller concentration of iodine (D(I2) ≤ 0.016 mmol/ml) and lower temperatures (e.g. T̄ = 850°C) the influence of H2O (from the wall of the silica ampoule) becomes more important. Under these conditions the transport of Cr2O3 is a result from the endothermic reactions (2), (3) and (4). H2,g has on the basis of the decomposition of HIg a positive difference of the solubility and H2,g should not to be considered as a transport agent. Because of the range of equilibrium-values the reaction 4 has to be taken into consideration.Estimated value of the enthalpie for CrOI2,g is fixed more precisely by thermodynamic model calculation to ΔfH°298(CrOI2,g) = -51.4 kcal/mol. The estimated limit of error for the enthalpie of formation is smaller than ± 5 kcal/mol.Without an addition of CrI3 is in the system Cr2O3/I2 a migration of Cr2O3 not observable.
    Notes: Cr2O3 wandert bei Zugabe von Iod (z. B. 0,1 mmol/ml) und CrI3 im Temperaturgradienten 1 000°C→900°C über das bislang unbekannte Oxidiodid CrOI2 und CrI2 (Gl. 1), wobei CrI4 als Transportmittel anzusehen ist Mit kleineren Transportmitteldichten (D(I2) ≤ 0,016 mmol/ml) sowie weniger hoher Temperatur (z. B. T̄ = 850°C) gewinnt der Einfluß von H2O und demgemäß ein Transport von Cr2O3 über die endothermen Gleichgewichte Gl. (2) bis (4) an Bedeutung. Der Wasserstoff in Gl. (4) besitzt in den Modellrechnungen aufgrund des Zerfalls von HI eine positive Löslichkeitsdifferenz und sollte damit als Transportmittel nicht in Frage kommen. Unter den genannten Bedingungen ist diese Reaktion aufgrund der Größenordnung der Kp-Werte ebenfalls zu berücksichtigen. Thermodynamische Modellrechnungen ermöglichen, die Bildungsenthalpie des Oxidiodids auf ΔBH°298(CrOI2,g) = -51,4 kcal/mol mit einem geringeren Fehler als ± 5 kcal/mol einzugrenzen.Im System Cr2O3/I2 war ohne Zusatz von CrI3 kein Transporteffekt zu beobachten.
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  • 166
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1983-1985 
    ISSN: 0044-2313
    Keywords: Metal hydrides ; rhodium ; lithium ; crystal structure ; neutron diffraction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of Li3RhH6  -  a Ternary Hydride with Isolated [RhH6]3- OctahedraThe ternary rhodium hydride Li3RhH6 was synthesized by the reaction of lithium hydride with rhodium under a hydrogen pressure of 80 bar. X-ray investigations on powdered samples and an elastic neutron diffraction experiment on the deuterated compound led to the complete structure determination (space group: Pnma, Z = 4). The atomic arrangement is isotypic to the Na3RhH6 structure type. The crystal structure contains isolated [RhH6]3- octahedra, which are separated by the lithium ions.
    Notes: Die Synthese von Li3RhH6 gelingt durch Umsetzung von Lithiumhydrid mit feinverteiltem Rhodium unter einem Wasserstoffdruck von 80 bar. Röntgenographische Untersuchungen an pulverförmigen Proben und ein elastisches Neutronenbeugungsexperiment an der deuterierten Verbindung führten zur Strukturaufklärung (Raumgruppe: Pnma, Z = 4). Die Verbindung ist isotyp zu der von Na3RhH6 und enthält isolierte [RhH6]3--Oktaeder, die durch die Lithiumionen separiert werden.
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  • 167
    ISSN: 0044-2313
    Keywords: Indium digermanate ; indium disilicate ; crystal structure ; indium luminescence ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Strukturuntersuchungen und Lumineszenz von In2Ge2O7 und In2Si2O7Eine Rietveld-Pulverdiagramm-Methode erlaubt die Bestimmung der genauen Strukturen von Thortveitit verwandten In2Ge2O7 und In2Si2O7 Oxyden (Raumgrupe C2/m, Z = 2). Die Verbindungen wurden unter normalem Druck hergestellt. Die Lumineszenz unter 160 und 200 K sollte die Messung der Umwelt Neutrinobestrahlung erlauben. Sie scheint die Folge eines inneren Ladungstransfers in den Indium Sauerstoff Polyedern zu sein. Die optischen Resultate wurden an Hand der bestimmten Strukturen und der chemischen Bindungen diskutiert und mit Werten für andere Indiumoxyde verglichen.
    Notes: The crystal structures of the ordinary pressure forms of indium digermanate In2Ge2O7 and disilicate In2Si2O7 have been studied from X-ray powder diffraction data by Rietveld refinement. They are closely related to that of the thortveitite which crystallizes in the monoclinic system with the space group C2/m and Z = 2. They show luminescence properties below 160 K and 200 K respectively. The luminescence is discussed in terms of crystal structure and compared to that of some other luminescent indium oxides.
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  • 168
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1976-1982 
    ISSN: 0044-2313
    Keywords: Gas complex ; MnAlF5 ; mass spectroscopy ; enthalpie of dissociation ; ab initio calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Gas Complex MnAlF5 and its Influence on the Purification of AlF3 by SublimationThe gas complex MnAlF5 has been determined mass spectroscopically by the ions MnAlF5+ and MnAlF4+. The gas complex MnAlF5 is formed above 973 K by heating up mixtures of AlF3/MnF2 or AlF3 · 3 H2O endowed with Mn2+ or by heating up solid MnAlF5 too. At 1 008 K the enthalpie of dissociation is 197 kJ/mole. The equilibrium structures of the high spin molecule MnAlF5 (S = 5/2) were examined with ab initio calculations at the HF-level by comlete gradient optimizing. Two minimum structures were found on the potential energy surface. A bidentate fluorine bridged structure was found to be the most stable at the HF-level. Vibrational frequencies and thermodynamic functions of complex formation were estimated for both minimum structures. The importance of the formation of the gas complex for the separation of MnF2 and AlF3 by sublimation is discussed.
    Notes: Der Gaskomplex MnAlF5 wurde bei massenspektrometrischen Untersuchungen durch die Ionen MnAlF5+ und MnAlF4+ nachgewiesen; er bildet sich beim Aufheizen von AlF3/MnF2-Gemengen, Mn-dotiertem AlF3 · 3 H2O bzw. festem MnAlF5 oberhalb 973 K. Die experimentell ermittelte Dissoziationsenthalpie bei 1 008 K für den Zerfall MnAlF5(g) = MnF2(g) + AlF3(g) beträgt 197 kJ/mol. Die Gleichgewichtsstrukturen von MnAlF5(g) (high spin; S = 5/2) wurden durch ab initio Berechnungen auf HF-Niveau durch vollständige Gradientenoptimierung ermittelt. Zwei Minimumstrukturen wurden gefunden. Eine zweifach F-verbrückte Ringstruktur ist auf HF-Niveau die stabilste. Schwingungsfrequenzen und thermodynamische Komplexbildungsfunktionen werden für beide Minimumstrukturen angegeben. Die Bedeutung des Gaskomplexes für die sublimative Trennung von MnF2 und AlF3 wird diskutiert.
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  • 169
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    Zeitschrift für anorganische Chemie 620 (1994), S. 1971-1975 
    ISSN: 0044-2313
    Keywords: Tellurium ; niobium oxytrihalides ; poly(heptatellurium(2+)) ; tetrachlorooxoniobate (1-) ; tetrabromooxoniobate (1-) ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tellurium Cations stabilized by Niobium Oxytrihalides: Synthesis and Crystal Structure of Te7NbOBr5 and Te7NbOCl5The reaction of Te2Br with NbOBr3 in a sealed evacuated glass ampoule at 225°C yields Te7NbOBr5 in form of bright black needles. Te7NbOCl5 is obtained from tellurium, TeCl4 and NbOCl3 at 220°C. Both compounds crystallize orthorhombic in the space group Pcca (Te7NbOBr5: a = 2 651,9(4) pm, b = 836.6(1) pm, c = 794.6(1) pm; Te7NbOCl5: a = 2 597.7(5) pm, b = 805.1(1) pm, c = 791.2(1) pm). The crystal structure determinations show that Te7NbOBr5 and Te7NbOCl5 are built of one-dimensional polymeric tellurium cations, one-dimensional associated pyramidal NbOX4 groups (X = Cl, Br) and isolated halide anions. Magnetic properties of Te7NbOX5 were determined and confirm the expected diamagnetism. Te7NbOX5 can thus be formulated as ∞1[Te72+] ∞1[NbOX4-] (X-). The charge distribution in the structure type Te7MOX5 (M = W, Nb; X = Cl, Br) became clear by synthesis and characterisation of the two niobium containing compounds.
    Notes: Durch Reaktion von Te2Br mit NbOBr3 in einer evakuierten Glasampulle bei 225°C entsteht Te7NbOBr5 in Form von schwarzglänzenden, stäbchenförmigen Kristallen. Te7NbOCl5 wird aus Te, TeCl4 und NbOCl3 bei 220°C erhalten. Beide Verbindungen kristallisieren im orthorhombischen Kristallsystem in der Raumgruppe Pcca (Te7NbOBr5: a = 2 651,9(4) pm, b = 836,6(1) pm, c = 794,6(1) pm; Te7NbOCl5: a = 2 597,7(5) pm, b = 805,1(1) pm, c = 791,2(1) pm). Die Kristallstrukturanalysen zeigen, daß Te7NbOBr5 und Te7NbOCl5 aus eindimensionalen polymeren Tellur-Kationen, eindimensionalen Strängen von pyramidalen, über O-Atome assoziierten NbOX4-Einheiten und aus isolierten Halogenidionen aufgebaut sind. Magnetische Messungen bestätigen den erwarteten Diamagnetismus und zeigen, daß Nb in der formalen Oxidationsstufe + V vorliegt. Die ionische Schreibweise lautet daher ∞1[Te72+] ∞1[NbOX4-] (X-). Die Synthese und Charakterisierung der beiden niobhaltigen Vertreter klärt die Ladungsverteilung im Strukturtyp Te7MOX5 (M = W, Nb; X = Cl, Br).
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  • 170
    ISSN: 0009-2940
    Keywords: Platinum complexes, five-coordinate ; Nitrosyl complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The title complex has been prepared in 36% yield by reaction of [NBu4]2[trans-Pt(C6Cl5)2Cl2] with NOClO4 (1:1) in CH2Cl2. The anion exhibits an almost tetragonal-pyramidal geometry (X-ray analysis), the platinum atom being virtually located in the basal plane and the NO ligand occupying the apical position. The Pt—N—O unit is bent [119.5(8)°].
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  • 171
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 791-793 
    ISSN: 0009-2940
    Keywords: Transition-metal ion chemistry ; O2-bond activation ; Bond dissociation energies ; Rate constants ; Ion cyclotron resonance mass spectrometry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bond dissociation energies and the heats of formation of the complexes Fe+—NCH (6) and Fe+—CNH (10) have been determined. The HCN ligand in 6 is by 3 kcal/mol less strongly bound to Fe+ than HNC in 10, and complex 6 is 13 kcal/mol more stable than 10. Isomerization of 10 to 6 is difficult if not impossible to bring about as, upon collisional activation, mutual isomerization cannot compete with ligand detachment. In addition, the ion-molecule reactions of 6 and 10 with O2 give rise to distinct product distributions.
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. A41 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
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  • 173
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 797-804 
    ISSN: 0009-2940
    Keywords: Heteronuclear complexes ; Ligand [(en)2MIII(OH)2]+ (M = Cr, Co) ; Complexes of third group elements ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complexes of Third Group Elements with [(en)2MIII(OH)2] Ligands (M = Cr, Co)Heteronuclear complexes are formed on reaction of cis-[(en)2-MIII(OH)(H2O)]2+ (M = Cr, Co; en = ethylenediamine) with A1III, GaIII, InIII, and T1III in aqueous solution. The following salts with tetranuclear cations have been isolated: [A1{(OH)2-Cr(en)2}3](S2O6)3 · 13 H2O (1), [A1{(OH)2Co(en)2}3](S2O6)3 · 5 H2O (2), [Ga{(OH)2Co(en)2}3](S2O6)3 · 5 H2O (3), [In{(OH)2-Cr(en)2}3](S2O6)3 · 6 H2O (5), and [In{(OH)2Co(en)2}3]-(ClO4)4Cl2 · 4 H2O (6). Furthermore, the dinuclear neutral complexes [InCl4{(OH)2Cr(en)2}] (4) and [TlCl4{(OH)2-Cr(en)2}] · 0.5 H2O (7) are prepared. X-ray analyses confirm that in all cases the [(en)2MIII(OH)2] groups act as bidentate ligands in the hydroxo-bridged heterometallic complexes.
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  • 174
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 67-71 
    ISSN: 0009-2940
    Keywords: Gallium compounds ; Heterocubanes, gallium-phosphorus ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Characterization of Gallium-Phosphorus HeterocubanesThe reaction of iPrGaCl2 with tBuPLi2 in Et2O at -78°C gives the heterocubane [iPrGaP(tBu)]4 (1) by using the “dilution principle”. {(MesGa)3[GaP(H)tBu][P(tBu)]4} (2) was formed, when three equivalents of MesGaCl2 and one equivalent of GaCl3 in THF at -78°C were treated with 5 equivalents of tBuPLi2. Compounds 1 and 2 were characterized by NMR, IR, and MS techniques as well as by X-ray structure determination. The heterocubane molecules of 1 are disordered in the crystal; every atom site of the central cubical frame work is occupied by gallium and phosphorus atoms (occupation factor 0.5). The structure of 2 contains two crystallographically unique molecules, which are not disordered because of the additional P(H)tBu groups.
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  • 175
    ISSN: 0009-2940
    Keywords: Boranes ; Aminoboranes ; Phosphanyliminoboranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 221[1].  -  Kinetic and Thermodynamic Product Control in the Addition of HX Compounds to an Amino Phosphanylimino Borane R2N—B≡N—PR2′The reaction of equimolar amounts of HI with tmp=B≡N—PtBu2 (3) (tmp = 2,2,6,6-tetramethylpiperidino group) in an unpolar solvent yields the phosphonium salt [tmp-B=N—PHtBu2]I (4). No such well-defined reaction was observed with triflic or tetrafluoroboric acid. In contrast, HCl reacts with 3 to produce a mixture of tmp-B(Cl)-NH-PtBu2 (5) and tmp - B(Cl) - N=PHtBu2 (6). On heating or on standing at ambient temperature the unique proton of 5 migrates from the N to the P atom with formation of 6, which, therefore, is thermodynamically more stable than 5.
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 829-833 
    ISSN: 0009-2940
    Keywords: N-Isocyandialkylamine complexes ; Cyanamide complexes ; Guanidine complexes ; Reactions at the coordinated ligand ; N—N bond breakage ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal Complexes of Functional Isocyanides, XXIV.  -  Reactions of N-Isocyanodialkylamine Complexes with Secondary AminesReactions of pentacarbonyl(N-isocyanodialkylamine) group 6-metal complexes [M(CO)5CNNR2] [M = Cr, W; R = Et, iPr; 2R = -{MeCH(CH2)3CHMe}-] with secondary amines proceed with cleavage of the N—N bond and C→N migration of the metal to give the corresponding N-cyanamide complexes [M(CO)5NCNR′2] (1a-2g) [R′ = Me, Et, nPr, nBu; 2R′ = —(CH2)4—, —(CH2)5—, —(CH2)2O(CH2)2—]. However, when diiodobis(N-isocyanodialkylamine)platinum(II) was allowed to react with an excess of the amine amine(guanidine)platinum(II) complexes [PtI2(HNR′2){HN=C(NR′2)2}] (3a-c) [R′ = Et; 2R′ = —(CH2)5—, —(CH2)2O(CH2)2—] were obtained. Structural assignments are made on the basis of IR, NMR (1H, 13C), and mass spectroscopy as well as of an X-ray structure analysis of trans-[PtI2(HNEt2){HN=C(NEt2)2}] (3a).
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  • 177
    ISSN: 0009-2940
    Keywords: Silver(I) complexes ; Bis(diphenylphosphanyl)-o-carborane ; o-Carborane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Silver(I) perchlorate or nitrate react readily with bis(di-phenylphosphanyl)-o-carborane to give the complexes [AgX{(PPh2)2C2B10H10}] [X = ClO4 (1), NO3, (2)]. The perchlorate ligand is weakly bound to the silver atom and thus can be displaced by other ligands affording the three-coordinated complexes [AgL{(PPh2)2C2B10H10}]ClO4 [L = PPh3 (3), PPh2Me (4), AsPh3 (5), C5H4NCOOH (6), C9H6NCOOH (7), SPPh3 (8)]. Compounds 3 and 4 can also be obtained by reaction of [Ag(OClO3)PR3] with the diphosphane. Treatment of complex 1 with bidentate ligands leads to the cationic four-coordinated [Ag(L—L){(PPh2)2C2B10H10}]ClO4 [L—L = (PPh2)2C2B10H10 (9), bipy (10), phen (11), (SPPh2)2CH2 (12)] or to the neutral [Ag(S2CNR2){(PPh2)2C2B10H10}] [NR2 = NEt2 (13), NC4H8 (14)]. The crystal structures of 11 and 12 have been established by X-ray crystallography. In both complexes the silver(I) atoms exhibit tetrahedral coordination by two phosphorus and two nitrogen or two sulfur atoms, respectively.
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  • 178
    ISSN: 0009-2940
    Keywords: Lithium compounds ; Hydrazines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dilithium N,N′-Bis(trimethylsilyl)hydrazide and a Hydrolysis Product: Side-On- and End-On-Coordinated Li Cations to N2-2 and O2-2N,N′-Bis(trimethylsilyl)hydrazine is converted into the dilithium derivative [(Me3Si)2N2Li2] · 2 thf (1) by nBuLi. Compound 1 forms a tetramer which lies on a crystallographic inversion centre. The Li+ ions are found to be end-on to the N—N units and also coordinated by thf, but three Li+ ions are also positioned symmetrically above the N—N bonds. The hydrolysis of 1 in air leads to the formation of [(Me3SiOLi)4 · Li2O2 · LiN(SiMe3)2] · 2 thf (2) which contains four oxide and one peroxide ions. The O2-2 unit is side-on-coordinated by three Li+.
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  • 179
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 849-851 
    ISSN: 0009-2940
    Keywords: Selenium iodides ; Imidazoles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Derivatives, IX.  -  Stabilisation of Selenium Diiodide by ComplexationHerrn Professor Helmut Werner zum 60. Geburtstag gewidmet.Stable selenium diiodide complexes 2 are obtained by the reaction of the 2-selenoxoimidazolines 1 with iodine. An X-ray structure analysis of 2c reveals its monomeric nature. In the trigonal bipyramid, the iodo substituents are situated in axial positions forming elongated iodine bonds [Se-I(1) 2.854(1), Se—I(2) 2.768(1) Å; I(1)—Se—I(2) 175.4(0)°].
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  • 180
    ISSN: 0009-2940
    Keywords: Gallium bis(amides) ; Gallium-silicon bond ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Chemistry of Gallium Compounds, II[1].  -  Preparation and Structure of Bis(2,2,6,6-tetramethylpiperidino)-[tris(trimethylsilyl)silyl]gallium  -  ein First Example for a Monomeric Bis(amino)gallane with Gallium-Silicon BondThe title compound tmp2GaSi(SiMe3)3 (4) (tmp = 2,2,6,6-tetramethylpiperidino) was prepared by the reaction of (Me3Si)3SiLi · 3 THF (2) with tmp2GaCl (3). The NMR data (1H, 13C, 29Si) and the crystal structure of 4 are discussed. It contains a trigonal planar-coordinated gallium atom with long Ga-N and Ga—Si bonds of 191 and 247 pm, respectively. This compound is the first fully characterized monomeric gallium bis(amide) and the second structurally investigated compound with a gallium-silicon bond.
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  • 181
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 113-117 
    ISSN: 0009-2940
    Keywords: Phthalocyanines ; dienophilic and enophilic ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Dienophilic and Enophilic PhthalocyaninesFrom 1,2,3,4-tetrahydro-2,3-dimethylen-1,4-epoxynaphthalene-6,7-dicarbonitrile (2) or the corresponding 1,3-diimino-1,3-dihydroisoindole 3 the hexadecahydro-octamethylenetetraepoxynaphthalocyanine 4 as well as the nickel and the iron complexes 5 and 6 containing enophilic side groups have been synthesized. From 1,4-dihydro-1,4-epoxynaphthalene-6,7-dicarbonitrile (8) and its corresponding 1,3-diimino-1,3-dihydroisonindole 9 the octahydro-tetraepoxynaphthalocyanines 10, 11, and 12, respectively, which contain dienophilic substituents, are obtained. 11 reacts with 2,3-dimethylbutadiene to form the adduct 13.
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 897-903 
    ISSN: 0009-2940
    Keywords: Dendrimers ; Supramolecular chemistry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dendrimers and Dendrimer Building Blocks with Trisubstituted Benzene and “Hexacyclene” as Core UnitsThe preparation of new dendritic compounds containing 1,3,5-substituted aromatic units or “hexacyclene” is described. Bulky dendrimers are obtained in few generations starting with polyfunctional core units like 1, 4, 5, 12, and hexacyclene (21). The dendrimers were synthesized by using both the divergent method (for 7) and the convergent method (for 13 and 22). 22 is the first dendrimer containing a crown unit as core.
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  • 183
    ISSN: 0009-2940
    Keywords: Chromium, [2-(methyleneamino)ethenyl]carbene complexes ; Michael addition of imines ; (1-alkynylcarbene)-chromium complexes ; 2H-Pyrroles ; Cyclization of {[2-(methyleneamino)ethenyl]carbene}chromium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imines 7, 11-13 were added to (1-alkynylcarbene)chromium complexes 6a-d to form {[2-(methyleneamino)ethenyl]-carbene}chromium complexes 8a-d, 14a-d, 15a-d, 16a-d in good to very good yields (63-98%) except for two cases (41-59%). The carbene ligands of the latter compounds cyclize to 2H-pyrroles 9a-d, 17a-d, 18a-d, 19a-d upon heating in tetrahydrofuran solution to 50-55°C.
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 941-946 
    ISSN: 0009-2940
    Keywords: Epoxidation ; Benzofuran ; Benzofuran epoxide ; Quinone methide ; Benzofuran-2-one ; 2,4-Cyclohexadien-1-one, spiroepoxide ; cis-Ene dione ; Perester, β-hydroxy- ; 1,3-Benzodioxole ; Keto enol ester ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The oxidation of the benzofurans 1a-f (tetrahydrobenzofurans 1g, h) with excess m-CPBA is reported. The in situ generated, highly reactive benzofuran epoxides 2a-f and their quinone methides 3a-f (cis-ene diones 3g, h) afford the labile tautomeric peroxy esters 5 and 5′ by nucleophilic addition of the peroxy acid. On elimination of m-chlorobenzoic acid, the peroxy esters 5/5′ of the benzofuran derivatives 1a-f rearrange thermally to the keto esters 6 by C—C cleavage or to the spiro epoxides 7 by C—O cleavage. The latter undergo thermal isomerization to the 1,3-benzodioxoles 8 and Diels-Alder cycloaddition to the corresponding dimers 9. Independently, the keto esters 6 and the 1,3-dioxoles 8 were synthesized by thermolysis of the dioxetanes 11. The tautomeric m-CPBA adducts 5/5′ of the persistent ene diones 3g, h, derived from the tetrahydrobenzofuran derivatives 1g, h, rearrange as well to the spiro epoxides 7g, h. In contrast to the benzofuran derivatives 6a-f, the keto enol ester 6h suffers Baeyer-Villiger rearrangement with another molecule of m-CPBA to form the ene diester 10h.
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  • 185
    ISSN: 0009-2940
    Keywords: Bicyclo[3.3.0]octane, derivatives of ; Semibullvalene ; Tricyclo[3.3.0.02-8]octa-3,6-diene ; Cyclooctatetraenes, substituted ; Cyanohydrins, O-(trimethylsilyl)- ; Hydrogen fluoride  -  phosphorus oxychloride  -  pyridine, elimination of trimethylsilanol by ; Phenyl cuprate reagent, conjugate addition of ; Phase-transfer catalysis ; Chlorination by hexachloroethane  -  sodium hydroxide ; Cyclization by dehydrochlorination ; Endoperoxides by triplet oxygen ; 2 H-Pyran, derivative of ; Thermochromism ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Addition of trimethylsilyl cyanide to the diphenylbicyclo[3.3.0]octanedione 8c is catalyzed by the potassium cyanide/18-crown-6 complex and produces a mixture of the diastereomeric bis[O-(trimethylsilyl)cyanohydrins] endo- and exo-10c (3:2). The hydrogen fluoride - pyridine complex in phosphorus oxychloride as solvent and, subsequently, an excess of pyridine convert the mixture of diastereomers 10c into the unsaturated y,y′-diphenyldinitrile 11. This is converted into the red semibullvalene 4 in a single step by treatment with hexachloroethane and concentrated aqueous sodium hydroxide in the presence of tetrabutylammonium hydroxide as phase-transfer catalyst  -  Above 30°C, 4 isomerizes in solution to a mixture of the cyclooctatetraenes 12 and 13. While the red crystals of 4 are stable in the atmosphere, in the dark affording the endoperoxide 16 and the yellow 2H-pyran derivative 17 (7:1) which result from parallel reactions. Only at temperatures as high s 110°C, 16 slowly rearranges to 17 which reacts further to yield well-defined but still unknown products. The simultaneous formation of 16 and 17 at low temperatures is interpreted in terms of endo and exo attack, respectively, of triplet oxygen at the benzylic carbon atoms of the semibullvalene 4 or the isomeric bicyclic diradical 21.  -  The structures of the new compounds are based on spectroscopic evidence and X-ray diffraction analyses of 4, endo-10c, 11, 16, and 17. The semibullvalene 4 exists as a pair of rapidly rearranging degenerate valence tautomers in solution and in the crystal as well. In the solid state, 4 exhibits apparent C2 symmetry and equal atomic distances C2-C8 and C4-C6 (201.9 pm). Because true degeneracy is highly unlikely in the crystal, the equal distribution of two non-equivalent valence tautomers at room termperature results from a fortuitous cancelling of the ΔH° and TΔS° terms governing the equilibrium.  -  The red colour of 4 in the crystal and in solution is due to a maximum at 444 nm which disappears on cooling. Thus, 4 not only belongs to the family of thermochromic semibullvalenes and barbaralanes devoid of a long wavelength chromophor like 1, 6 and 14, but also shows the most intensive maximum at the longest wavelength observed so far.
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 959-963 
    ISSN: 0009-2940
    Keywords: Rearrangements, thermal ; Propargyl-Cope reaction ; 1,5-Hexadiyne-3,4-diol ; Cyclobutene ; 3,4-diacetyl ; Fragmentations, retro-ene ; Tandem reactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal behavior of meso- and d,1-3,4-dimethyl-1,5-hexadiyne-3,4-diol (meso- and d,1-4) has been studied at 400°C in the gas phase. In a tandem reaction the diols isomerize via the bisallenes 5 first to cis- and trans-3,4-diacetylcyclobutene (cis- and trans-8) which have been detected as intermediates by 13C-NMR spectroscopy as well as catalytic hydrogenation to 1,2-diacetylcyclobutane (9). Subsequently, 8 stabilizes itself by ring opening to (E,Z)- and (E,E)-3,5-octa-dien-2,7-dione (E,Z) and [(E,Z)-6]. As a side reaction retroene cleavage of 4 to 2-butynone (10) and methyl vinyl ketone (12) is observed. By pyrolysis of the pure diastereomers 4 it is shown that the retro-ene process is more pronounced in the d,l than in the meso series.
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  • 187
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 985-990 
    ISSN: 0009-2940
    Keywords: Silyl triflates ; Polysiloxanes ; Polycarbosilanes ; Polysilylenealkynes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(trifluoromethylsulfonyloxy)organosilicon Compounds as Synthetic Materials for New Silicon PolymersThe new polycarbosilanes, polysiloxanes, and polysilylenealkynes 1c-6c were obtained by condensation of electrophilic α,ω-bis(trifluoromethylsulfonyloxy)organosilicon compounds 1b-6b with nucleophiles such as organolithium and organomagnesium compounds. The required silyl triflate derivatives 1b-6b have been prepared by reaction of the corresponding amino-, allyl-, or phenylsilanes 1a-6a with trifluoromethanesulfonic acid.
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  • 188
    ISSN: 0009-2940
    Keywords: Copper(II) complexes ; Mangan(II) complexes ; trinuclear ; Schiff bases ; macrocyclic ; Redox properties ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complexes with Macrocyclic Ligands, II.  -  Synthesis, Structure and Electrochemical Properties of a Macrocyclic Cu2IIMnII Complex of Schiff Base TypeA novel trinuclear Cu2Mn complex 4 of a macrocyclic Schiff base ligand obtained by condensation of 5-tert-butyl-2-hydroxy-1,3-benzenedicarbaldehyde with 1,2-phenylenediamine was synthesized. The molecular structure of 4 was determined by X-ray diffraction revealing a sandwich-type structure as depicted by Figure 2. Electrochemical investigations (DCV measurements) showed two one-electron reduction steps for the copper ions at E1/2 = -1.383 and -1.652 V (vs. Cp2Fe/Cp2Fe+).
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 165-172 
    ISSN: 0009-2940
    Keywords: Diastereoselectivity ; Protonation ; Pyrazines ; dialkoxydihydro- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Stereoselective Protonation of Carbanions, 2[1].  -  Diastereoselective Protonation of Schöllkopf's Bislactim Ether AnionsThe anions of the bis-lactim ethers 5-7 serve as models for a systematic investigation of diastereoselective protonation. From 5Li, 6Li, and 7Li in THF at -78°C 30 proton sources (—OH, —NH, —SH, —CH) of different acidity and bulkiness produce the following cis/trans ratios: 5 8:92 → 37:63; 6 15:85 → 48:52; 7 25:75 → 59:41 (equilibria ≈ 50:50). Substitution of R1 = iPr in 5 by Me (→ 6) decreases the stereoselectivity slightly, but substitution of OMe in 6 by OEt (7) much stronger (Table 1). Most of the added Lewis acids show week or even leveling effects, whereas with 5K a dramatic change is observed with cis/trans-5 = 27:73 → 89:11 (Table 2). By variation of solvent and several additives only minor effects on the cis/trans ratio are observed (Table 3). Backed by 13C—NMR spectra of the ion pairs and literature data protonation of 5Li-7Li is supposed to occur on a dimer, which will mainly react to give trans-5-7. The prevailing formation of cis-5 from 5K is explained by the reaction of the monomeric ion aggregat.
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 173-189 
    ISSN: 0009-2940
    Keywords: Diazo compounds ; Transition-metal complexes ; Photoisomerization ; Homocyclopropenylium ions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Small Rings, 78[1]. - Tri-tert-butyl(trimethylsilyl)cyclobutadiene and Tri-tert-butyl(trimethylsilyl)tetrahedraneThe chemistry of diazo(1,2,3-tri-tert-butylcyclopropenyl)(trimethylsilyl)methane (6) is unexpectedly diverse. Upon irradiation it fragments exclusively into the acetylenes 7 and 8. Flash thermolysis, on the other hand, gives  -  aside from the two acetylenes  -  tri-tert-butylazete (10) and trimethylsilyl cyanide (11). Upon heating 6 presumably isomerizes via betaine 17 to Dewar-diazabenzene 13  -  which is split into 10 and 11  -  and diazabenzvalene 18. This reaction course is supported by the isolation of the carbonyliron complexes 15 and 16,  -  The CuCl-catalyzed thermal decomposition again follows a different route. Under these conditions tri-tert-butyl(trimethylsilyl)cyclobutadiene (5) is formed, probably as a weak CuCl complex. Only after addition of ethylenebis(diphenylphosphane) free cyclobutadiene 5 can be isolated. Upon irradiation of 5 a quantitative isomerization to tri-tert-butyl(trimethylsilyl)tetrahedrane (29) occurs. This second, spectroscopically unequivocally confirmed tetrahedrane melts at 179°C. In solution the isomerization to cyclobutadiene 5 starts at about 160°C. That means, it is thermally even more stable than tetra-tert-butyltetrahedrane.
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 191-200 
    ISSN: 0009-2940
    Keywords: Diazo compounds ; Valence isomerization ; „Corset effect“ ; limits of ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Small Rings, 79[1].  -  Synthesis and Properties of Novel Silyl-Substituted Cyclobutadienes and TetrahedranesThe cyclobutadienes 2b, d as well as the corresponding tetrahedranes 3b, d have been prepared according to the “Masamune route” by starting from the diazo compounds 1b, d. Low-temperature 13C—NMR measurements of the cyclobutadienes 2a, b, d lead to the first exact values of the barrier heights in the interconversion of the two rectangular forms of the cyclobutadienes. Fluorodesilylation of 3d probably proceeds via tri-tert-butyltetrahedrane (3h) and cyclobutadiene 2h and finally yields diketone 18. Reaction of tetrahedrane 3d with LiAlH4 in boiling THF leads to tetrahedrane 3e, which is much less stable than all previously known tetrahedrane derivatives.
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  • 192
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 201-204 
    ISSN: 0009-2940
    Keywords: Diazo compounds ; Homologation ; Valence isomerization ; Germanium compounds ; Tetrahedranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Small Rings, 80[1].  -  Tri-tert-butyl(trimethylgermyl)cyclobutadiene and Tri-tert-butyl(trimethylgermyl)tetrahedraneIn the course of our research on silyl-substituted diazo compounds as precursors of cyclobutadienes and tetrahedranes the synthesis of the title compounds 16 and 17 has also been accomplished. Their properties are comparable to those of the silyl-substituted homologous compounds. Tri-tert-butyl(trimethylgermyl)tetrahedrane (17) melts without decomposition at 143°C and thus proves to be as stable as tri-tert-butyl(trimethylsilyl)tetrahedrane. The interconversion of the rectangular forms of tri-tert-butyl(trimethylgermyl)cyclobutadiene (16) proceeds with an activation energy below 4 kcal/mol, which is nearly the same as of tri-tert-butyl(trimethylsilyl)cyclobutadiene.
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  • 193
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 267-269 
    ISSN: 0009-2940
    Keywords: Betaine dye ; Solvatochromism ; Ylide ; Carbene reaction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of 3,5-di-tert-butyl-4-oxo-2,5-cyclohexadienylidene (3d) with pyridine affords 2,6-di-tert-butyl-4-(2,4,6-tri-tert-butylpyridinio)phenolate (1d)  -  which is not accessible by the classical route via pyrylium salts  -  in reasonable yield. Carbene 3d is generated by thermal decomposition of the corresponding quinone diazide 2d in cyclohexane. Betaine 1d shows the expected large solvatochromism.
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  • 194
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. A5 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 195
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 271-274 
    ISSN: 0009-2940
    Keywords: Pig liver esterase ; Enantioselective hydrolysis ; Asymmetrized neopentane ; Reactive chiral building block ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Novel Chiral Building Block with Neopentane Framework for Synthesis: Chemo-Enzymatic Preparation of (R)-CH3C(CH2OSO2CF3)(CH2Cl)(CH2Br)The pig liver esterase (PLE) catalysed hydrolysis of the prochiral malonic ester (BzlOCH2)(Me)C(COOMe)2 (1) leads to its chiral monoester 2 in selectivities up to 81% ee. Compound 2 is an ideal entry point for the enantioselective synthesis of 1,1′,1″-substituted neopentanes CH3C(CH2X)-(CH2Y)(CH2Z) with three different leaving groups, X, Y, and Z. CH3C(CH2OSO2CF3)(CH2Br)(CH2Cl) (8) is a versatile reactive building block for the asymmetric synthesis of compounds containing the neopentane-C5 skeleton.
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  • 196
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    Berichte der deutschen chemischen Gesellschaft 127 (1994) 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 197
    ISSN: 0009-2940
    Keywords: Metallocenes, dinuclear, silyl-bridged ; Antiferromagnetism ; Cyclic voltammetry ; Paramagnetic NMR spectroscopy ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dilithium salt of the 3a,4,7a,8-tetrahydro-4,4,8,8-tetra-methyl-4,8-disila-s-indacenediyl dianion (L2-, 2) was allowed to react with the solvated metal halides MX2 (M = Ni, Co, Cr) in the presence of the cyclopentadienyl (Cp) anion to give trans-CpMLMCp (3NiNi, 3CoCo, and 3CrCr) in yields up to 80%. The only cis isomers which could be detected were 4NiNi and 4CoCo. Similarly, the reaction of 2 with [CpVCl(PEt3)]2 gave the trans-vanadium analogue 3VV while the successive reaction of 2 with CrCl3 (THF)3 and PEt3 yielded the bridged half-sandwich (Et3P)Cl2CrLCrCl2(PEt3) (5CrCr). The mixed-metal dinuclear metallocene CpFel—NiCp (3FeNi) was synthesized from CpFel-, Cp- and solvated NiBr2. The molecules were characterized by mass spectrometry, elemental analyses, cyclic voltammetry, 1H—, 13C—, and 29Si—NMR spectroscopy and solid-state magnetic measurements. Cyclic voltammetry showed up to six electron transfers per molecule. A metal-dependent splitting of the half-wave potentials of up to 355 mV indicated rather strong electrostatic interaction between the metallocene units. The NMR results established unpaired spin on the ligands. Its distribution within the bridging ligand was correlated with the molecular orbital splitting and the magnetic interaction. Antiferromagnetic interaction was found for 3NiNi, 3CrCr, and 3VV with J = -11.6, -2.56, and -1.34 cm-1, respectively (H = -J · SA · SB). A temperature-dependent folding of the bridging ligand was deduced from the temperature behavior of the 1H—NMR signal shifts.
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  • 198
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1311-1316 
    ISSN: 0009-2940
    Keywords: 1-Iodoalkylmagnesium reagents ; Stability, configurational ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α-Iodoalkylmagnesium species were generated by reaction of 3-oxygenated 1,1-diiodoalkanes with isopropylmagnesium halides at -78%C. The resulting magnesium carbenoids were found to be configurationally stable at temperatures up to -20%C and were trapped by benzaldehyde or allyl iodide at low temperatures. Stereoselectivity on exchange of the diastereotopic iodine atoms in 3 was found to be low.
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  • 199
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1327-1329 
    ISSN: 0009-2940
    Keywords: Macrocyclic thioethers ; Adamantane as a building block ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 4,6:12,14-Di(1,3-adamantano)-1,9-dithiacyclohexadecane (1), 4,6:12,14:20,22-tri(1,3-adamantano)-1,9,17-trithiacyclotetracosane (2), and 5,7:14,16-di(1,3-adamantano)-1,2,10,11-tetrathiacyclooctadecane (3) have been obtained by intermolecular cyclization of 1,3-bis(2-bromoethyl)adamantane (4) with thioacetamide using a high-dilution technique. The reaction is concentration-dependent. The crystal structures of 1, 2, and 3 have been determined by single-crystal X-ray diffraction.
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  • 200
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    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1355-1357 
    ISSN: 0009-2940
    Keywords: Diphosphanylhydrazides ; Diphosphanes, dinitrogen-bridged ; Cycloplatinaphosphahydrazides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: While the transition metal complexes of bis(phosphanyl)amines (PII-N-PIII) have been known for over three decades, the ligating properties of the next homologue PIII-N-N-PIII have been unprecedented so far. The X-ray structures of cycloplatinaphosphanehydrazides, [(OR)2PN(Me)N(Me)P(OR)2-PtCl2], reveal short distances for the P-N [1.639(5) Å] bonds.
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