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  • Inorganic Chemistry  (8,920)
  • 1995-1999  (1,777)
  • 1990-1994  (3,613)
  • 1910-1914  (3,530)
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  • 1
    Electronic Resource
    Electronic Resource
    (1,1′,3,3′-Tetra-tert-butyl-5,5′-pentafulvalen) dithallium - Synthese und Kristallstruktur: Ein Beitrag zur Diskussion von nichtklassischen Thallium-Thallium-Wechselwirkungen (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1693-1697 
    Details
    ISSN: 0009-2940
    Keywords: Nonclassical T1(I)-T1(I) interactions ; Thallium, fulvalene complex ; (Cyclopentadienyl)thallium complex ; 5,5′;-Pentafulvalene, 1,1′;,3,3′;-tetra-tert-butyl-dithallium ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (1,1′,3,3′-Tetra-tert-butyl-5,5′-pentafulvalene)dithallium - Synthesis and Crystal Structure: a Contribution to the Discussion of Nonclassical TI(I)-TI(I) InteractionsReaction of 1,1′,3,3′-tetra-tert-butyl-5,5′-dihydropentafulvalenediyldilithium with stoichiometric amounts of thallium chloride affords the dinuclear complex (η5:(η5-tBu4C10H4)Tl2 (2). Compound 2 is air-and moisture-sensitive, and photolabile. It crystallizes in the space group P•1 and consists of two (cyclopentadienyl)thallium units which are connected by a central C-C bond and twisted against each other by 70°. The monomeric units of 2 form a two-dimensional polymer with a zick-zack chain of T1 atoms and a periphery of substituted cyclopentadienyl ligands. Rather short T1-T1 contacts of 3.760 and 3.998 Å are formed within a dimeric substructure. The geometry of the cyclopentadienyl ligands around the shortest T1-T1 bond is similar to that predicted by the theory for weak T1-T1 interactions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240804
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  • 2
    Electronic Resource
    Electronic Resource
    1,1′-Bis(diphenylphosphino)bicyclopropyl: Synthesis, Properties, Precursors, Derivatives, and Metal Complexes (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 423-431 
    Details
    ISSN: 0009-2940
    Keywords: Bicyclopropyl / Diphosphines, chelating ligands / Rhodium complexes / Gold complexes / Phosphine sulfides / Phosphine-boranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The title compound 4 has been prepared from readily available 2,3-bis(diphenylphosphinyl)-1,3-butadiene (1) through double cyclopropanation using Me2S(CH2)O to give 1,1′-bis(diphenylphosphinyl)bicyclopropyl (2), followed by reduction using HSiCl3/NEt3. Addition of sulfur to compound 4 yields the disulfide 5, and reaction with tetrahydrofuran - borane affords the 1:2 adduct with BH3 (6). Quaternization reactions with MeI or CH2I2 give the double quaternary salts 7 and 8, respectively. Single dehydrohalogenation employing nBuLi converts 8 into the cyclic semiylide salt 9. 4 is an excellent ligand for lowvalent late transition-metal cations. With PdI2 the 1:1 complex LPdI2 (10, with L = 4), and with [(CO)2RhCl]2 the ionic 2:1 complex L2Rh+Cl- (11) are obtained. Experiments with (CO)AuCl yield the 1:2 complex L(AuCl)2 (12), X-ray structure analyses were performed with single crystals of the disulfide 5, as well as the rhodium(I) and gold(I) complexes 11 and 12. 5 has a conformation between s-cis and s-trans with the PS functions pointing away from each other at opposite ends of the molecule. By contrast, in the gold(I) complex the ligand approaches an s-cis conformation, and through rotations about P-C and C-C bonds - as referred to the conformation of 5 - the metal atoms are brought into close contact: Au…Au = 3.085 Å. Through temperature-dependent NMR investigations of compounds 5 and 12, and by comparison with values calculated or experimentally determined for related bicyclopropyl compounds (available in the literature), the energy of the Au…Au attraction has been estimated to be ca. 6 kcal/mol. Compound 11 features a square-planar, double-chelate cation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230303
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  • 3
    Electronic Resource
    Electronic Resource
    1,1′-Bis(methylphenylphosphanyl)ferrocene: Synthesis and Complexes with the Tetracarbonylchromium Fragment (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 689-693 
    Details
    ISSN: 0009-2940
    Keywords: Ferrocene, 1,1′-bis(methylphenylphosphanyl)- ; Chromium, carbonyl-, phosphane derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,1′-Bis(methylphenylphosphanyl)ferrocene (mppf) (2) was synthesized from dilithioferrocene and PMePh(OC6H4-4-Me). The diastereomers rac-2 and meso-2 were separated by fractional crystallization from ethanol. The tetracarbonyl-chromium complexes (rac-2)Cr(CO)4 (rac-5) and (meso-2)Cr(CO)4 (meso-5) were obtained photochemically from hexacarbonylchromium and mppf in near quantitative yield. The structures of rac-2, rac-5, and meso-5 were determined by X-ray crystallographic analysis.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280706
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  • 4
    Electronic Resource
    Electronic Resource
    1,1′-Disubstituierte Titanocen-dithiolen-Chelate des Typs (η5-Me3EC5H4)2Ti(S2C2R2) (E = C, Si, Ge) (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1805-1811 
    Details
    ISSN: 0044-2313
    Keywords: Dithiolene chelates ; titanocene complexes ; η5-trimethylelementcyclopentadienyl complexes ; temperature-dependent 1H NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,1′-Disubstituted Titanocene Dithiolene Chelates of Type (η5-Me3EC5H4)2Ti(S2C2R2) (E = C, Si, Ge)Reaction of the titanocene dichlorides (η5-Me3EC5H4)2TiCl2 (E = C, 1a; E = Si, 1b; E = Ge, 1c) with the 1,2-dithiolates (NaS)2C2H2, (NaS)2C2(CN)2 or (LiS)2C6H3Me-4 gave the new titanocene dithiolene chelates (η5-Me3EC5H4)2Ti(S2C2H2) (2a-c), (η5-Me3EC5H4)2Ti[S2C2(CN)2] (3a-c) and (η5-Me3EC5H4)2Ti(S2C6H3Me-4) (4a-c). These have been characterized by 1H NMR, IR, and mass spectroscopy, and have been compared with the unsubstituted η5-C5H5 analogues 2d, 3d and 4d. Activation energies for the chelate ring inversion in solution of 2a-c, 3a-d and 4a-c have been estimated by temperature-dependent 1H NMR spectroscopy.
    Notes: Die Reaktion der Titanocen-dichloride (η5-Me3EC5H4)2TiCl2 (E = C, 1a; E = Si, 1b; E = Ge, 1c) mit den 1,2-Dithiolaten (NaS)2C2H2, (NaS)2C2(CN)2 oder (LiS)2C6H3Me-4 ergab die neuen Titanocen-dithiolen-Chelate (η5Me3EC5H4)2Ti(S2C2H2) (2a-c), (η5-Me3EC5H4)2Ti[S2C2(CN)2] (3a-c) und (η5-Me3EC5H4)2Ti(S2C6H3Me-4) (4a-c). Sie wurden durch 1H-NMR-, IR- und Massen-Spektroskopie charakterisiert und mit den unsubstituierten η5-C5H5-Analoga 2d, 3d und 4d verglichen. Für 2a-c, 3a-d und 4a-c wurden die Aktivierungs-energien der Chelatringinversion in Lösung aus temperatur-abhängig aufgenommenen 1H-NMR-Spektren abgeschätzt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946201024
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  • 5
    Electronic Resource
    Electronic Resource
    1,1′-Ferrocendichalkogenato-Derivate des Oktachlor-cyclotetraphosphazensProfessor Günter Schmid zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 545-553 
    Details
    ISSN: 0044-2313
    Keywords: Cyclotetraphosphazenes ; [3]ferrocenophanes ; NMR spectra ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,1′-Ferrocene Dichalcogenato Derivatives of Octachloro-cyclotetraphosphazeneMononuclear 1,1′-ferrocenedichalcogenato derivatives of octachloro-cyclotetraphosphazene, fcE2[P4N4Cl6] (E = O (12), S (13), Se (14), have been prepared and characterized by 1H, 13C and 31P NMR spectroscopy as well as mass spectrometry.1) The molecular structures of 12--14 were determined by X-ray crystallography. While the 11′-ferrocene diolato complex, fcO2[P4N4Cl6] (12), possesses a 1,3-transannular bridged structure, the dithiolato and diselenolato analogues, 13 and 14, are spiro compounds containing 1,3-dichalcogena-2-phospha-[3]ferrocenophane rings. According to their temperature-dependent NMR spectra, 13 and 14 are nonrigid molecules above room temperature in solution.
    Notes: Es wurden einkernige 1,1′-Ferrocendichalkogenato-Derivate des Oktachlor-cyclotetraphosphazens, fcE2[P4N4Cl6] (E = O (12), S (13), Se (14), dargestellt und mit Hilfe der 1H-, 13C- und 31P-NMR-Spektroskopie sowie der Massenspektrometrie charakterisiert.1) Die Molekülstrukturen von 12-14 wurden durch Röntgenstrukturanalysen bestimmt. Während der 1,1′-Ferrocendiolato-Komplex, fcO2[P4N4Cl6] (12), eine 1,3-transannular verbrückte Struktur besitzt, sind die Dithiolato- und Diselenolato-Analoga, 13 und 14, Spiroverbindungen mit l,3-Dichalkogena-2-phos pha-[3]ferrocenophan-Ringen. Entsprechend den temperaturabhängigen NMR-Spektren sind 13 und 14 oberhalb Raumtemperatur in Lösung nichtstarre Moleküle.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230185
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  • 6
    Electronic Resource
    Electronic Resource
    1,1,3,3-Tetraalkoxy-2-azaallylium-Salze: Darstellung und stereochemische Eigenschaften (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 2487-2492 
    Details
    ISSN: 0009-2940
    Keywords: 2-Azapropenylium salts ; 2-Azaallenium salts ; 2-Azaallylium salts ; Carbamates, N-(dialkoxymethylene) ; Calculations, ab initio ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,1,3,3-Tetraalkoxy-2-azaallylium Salts: Synthesis and Stereochemical Properties The title salts 1 were synthesized in satisfactory yield by regioselective alkylation at the carboxyl oxygen atom of N-(dialkoxymethylene)carbamates 7 with oxonium salts 8. According to IR, 1H- and 13C-NMR spectra, in solution a bent 2-azaallyl cation structure is strongly favored over a linear cumulenic form. Dynamic NMR spectra indicate a barrier of ca. 11.7 kcal/mol between these two valence isomers. - Quantum mechanical calculations (ab initio 3-21G optimizations) on the model compound 1,1,3,3-tetrahydroxy-2-azaallylium (9) confirm the 2-azaallyl structure as the global minimum on the energy hyperface. 2-Azaallenium structures are calculated to be ca. 20 kcal/mol higher in energy. The conformations of the hydroxy groups depend on the C - N - C bond angle. The best isomeric N-protonated N-(dialkoxymethylene)carbamate 10a is predicted to be favored by ca. 3 kcal/mol over the energy lowest 2-azaallylium structure 9a.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921251122
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  • 7
    Electronic Resource
    Electronic Resource
    1,1,3,3-Tetrachlordisilazan169. Mitteilung zur Chemie der Silicium - Stickstoff-Verbindungen. 168. Mitt.: H. P. Baldus, W. Schnick, U. Wannagat, G. Bogedain. SiPN3 Chem. Mater. 5 (1993) 845 (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 239-248 
    Details
    ISSN: 0044-2313
    Keywords: 1,1,3,3-tetrachlorodisilazane ; silicon coordination compounds ; IR-spectra ; Raman spectra ; NMR spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,1,3,3-TetrachlorodisilazaneThe new compound 1 can be prepared by the reaction of calciumoctamminedichloride, CaCl2(NH3)8, with trichlorosilane, HSiCl3. IR, Raman, 1H and 29Si NMR spectra show a planar Si2NH framework, probably C2-symmetry of the whole molecule and a symmetrical distribution of the four chlorine atoms.In 1 we have got a compound with Bronsted and Lewis acidity, which reacts with three equivalents of pyridine to HSiCl2(py)2—NH(py)—HSiCl2. This addition compound exhibits a fourfold and a sixfold coordinated silicon atom as is shown by a 29Si-solid-NMR spectrum. By thermal decomposition of 1 the new compound 1,3,5-trichloro-2,4,6-tris(dichlorosilyl)-cyclo-1,3,5-trisil-2,4,6-triazane, Si6Cl9H6N3, 4, is formed. With piperidine, 1 reacts by substitution of all four chlorine atoms to compound 5, whereas with diazomethane the NH-functionality is converted to a NCH3 group in 6. Attempts of lithiation lead mainly to a substitution of the chlorine atoms by alkyl groups
    Notes: Durch Umsetzung von Calciumoktammindichlorid, CaCl2(NH3)8, mit Trichlorsilan, HSiCl3, kann die bisher unbekannte Verbindung 1,1,3,3-Tetrachlordisilazan, 1, Si2Cl4H3N, erhalten werden. IR-, Raman-, 1H- und 29Si-NMR-Spektren lassen auf ein planares Si2NH-Gerüst, wahrscheinlich C2-Molekülsymmetrie und symmetrische Verteilung der vier Chloratome schließen.1 zeigt sowohl Brönsted- als auch Lewis-Acidität und reagiert mit drei Äquivalenten Pyridin zu HSiCl2(py)2—NH(py)—HSiCl2, mit laut 29Si-Festkörper-NMR-Spektrum einem sechsfach und einem vierfach koordinierten Si-Atom.Die thermische Zersetzung von 1 führt u. a. zum bisher unbekannten 1,3,5-Trichlor-2,4,6-tris(dichlorsilyl)-cyclo-1,3,5-trisil-2,4,6-triazan, Si6Cl9H6N3, 4. Mit Piperidin reagiert 1 unter Substitution der vier Cl-Atome zu Verbindung 5, mit Diazomethan unter Überführung der NH in eine NCH3-Gruppe zu 6. Lithiierungsversuche von 1 führen bevorzugt zur Cl-Substitution durch Alkylgruppen.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210213
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  • 8
    Electronic Resource
    Electronic Resource
    [1,1,3,3-Tetrakis(dimethylamino)-1λ5, 3λ5-diphosphet]trimethylaluminiuin und -indiumProfessor Walter Siebert zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 919-928 
    Details
    ISSN: 0044-2313
    Keywords: 1λ5, 3λ5-diphosphete ; aluminium ; indium complexes ; n.m.r ; mass ; ir spectra ; X-ray structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [1,l,3,3-Tetrakis(dimethylamino)-1λ5, 3λ5-diphosphet]trimethylaluminiuin and -indium1,1,3,3-Tetrakis(dimethylamino)-1λ5, 3λ5-diphosphet, 1, reacts with A1(CH3)3 and In(CH3)3 to give the complexes [l,l,3,3-tetrakis(dimethylamino)-1λ5, 3λ5-diphosphete]-trimethylaluminium, 2, and [1,1,3,3-Tetrakis(dimethylamino)-l,1λ5, 3λ55-diphosphete]-trimethylindium, 3, as crystalline products, respectively. Properties, n.m.r., mass and i.r. spectra are reported and interpreted. Compounds 2 and 3 are further characterized by X-ray structural analyses; the bonding situation in both complexes is discussed in detail
    Notes: 1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphet, 1, reagiert mit Al(CH3)3 bzw. In(CH3)3 zu den Komplexen [1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphet]trimethylaluminium, 2, bzw. [1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphet]trimethylindium, 3, die jeweils als kristalline Produkte erhalten werden. Die Eigenschaften, NMR-, Massen- und IR-Spektren werden mitgeteilt und interpretiert. 2 und 3 sind zusätzlich durch Kristallstrukturanalysen charakterisiert; die Bindungsverhältnisse in beiden Komplexen wurden eingehend diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.199762301145
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  • 9
    Electronic Resource
    Electronic Resource
    1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphet als Ligand in Koordinationsverbindungen (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 612 (1992), S. 56-62 
    Details
    ISSN: 0044-2313
    Keywords: 1λ5,3λ5-diphosphete ; addition compounds with GeCl2, SnCl2, (CO)5W(Z-cyclooctene) ; n.m.r., i.r., mass spectra ; X-ray structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphete as Ligand in Coordination Compounds1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphete, 1, reacts with GeCl2 · 1,4-dioxane, SnCl2, and (CO)5W(Z-cyclooctene) to give the complexes {HCP[N(CH3)2]2}2 · GeCl2, 3, {HCP[N(CH3)2]2}2 · SnCl2, 4, and {HCP[N(CH3)2]2}2 · W(CO)5, 5, respectively. The n.m.r., mass, and i.r. spectra of the new compounds as well as the crystal and molecular structures of 3 and 4 are reported and the bonding situation in compounds 3-5 is discussed.
    Notes: 1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphet, 1 bildet mit GeCl2 · 1,4-Dioxan, SnCl2 bzw. (CO)5W(Z-cycloocten) die komplexe {HCP[N(CH3)2]2}2 · GeCl2, 3, {HCP[N(CH3)2]2}2 · SnCl2, 4, bzw. {HCP[N(CH3)2]2}2 · W(CO)5, 5. Die NMR-, Massen- und IR-Spektren der neuen Verbindungen sowie die Kristall- und Molekülstruktur von 3 und 4 werden mitgeteilt und die Bindungsverhältnisse in den Verbindungen 3-5 diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926120111
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  • 10
    Electronic Resource
    Electronic Resource
    1,1-Dithio-oxalat als Brückenligand in Zwei- und Dreikernkomplexen (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 613 (1992), S. 119-122 
    Details
    ISSN: 0044-2313
    Keywords: 1,1-Dithio-oxalate ; Cu12Cu11 complex ; EPR spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,1-Dithio-oxalate as Bridging Ligand in Bi- and Trinuclear Complexes1,1-Dithio-oxalate (i-dto), a four-dentate chalcogenrich ligand, possesses the unique constitution of C—C coupled CO2 and CS2. Due to its ambident behaviour i-dto forms mononuclear complexes and defined homo- and heterobimetallic bi- and trinuclear complexes. Obviously as a combined result of the symmetry and the electron distribution the ligand acts preferably bridging. The formation of coordination polymers can be prevented using coordinatively halfside-saturated species „(Ph3P)2M+“ (M = Cu, Ag). From EPR investigations of a trinuclear Cu21Cu11 complex we could get information about the coordination geometry and the electron distribution.
    Notes: 1,1-Dithio-oxalat (i-dto) als vierzähniger chalkogenreicher Ligand hat die interessante Konstitution von C—C-gekoppeltem CO2 und CS2. Aufgrund seines ambidenten Verhaltens bildet i-dto definierte Einkernkomplexe sowie homo- und heterobimetallische Zwei- und Dreikernkomplexe, wobei die Funktion als Brückenligand auch infolge der Symmetrie und Elektronenverteilung des Liganden offenbar bevorzugt ist. Die Bildung von Koordinationspolymeren läßt sich durch koordinativ halbseitig gesättigte Komplexfragmente „(Ph3P)2M+“ (M = Cu, Ag) unterbinden. Aus EPR-spektroskopischen Untersuchungen eines dreikernigen Cu21Cu11-Komplexes konnten Informationen über die Koordinationsgeometrie und Elektronenverteilung erhalten werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926130121
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