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  • Inorganic Chemistry  (322)
  • 1995-1999  (176)
  • 1935-1939  (146)
  • 1
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der Zerfall des Ameisensäuredampfes wird an Kupfer-Palladium-Legierungen nach der statischen Methode untersucht. Die Reaktion verläuft nach der nullten Ordnung.In der Reihe der Mischkristalle mit ungeordneter Atomverteilung wird die Aktivierungsenergie des wirksameren Bestandteils (Pd, 8 kcal) durch Beimischung des Kupfers (23,4 kcal) erhöht, es tritt also eine Abschwächung ein; von 0-62 Atom-% Pd haben die Legierungen die Aktivierungsenergie des Kupfers.Die Legierungen mit geordneter Atomverteilung zeigen eine starke Erniedrigung der Aktivierungsenergien; diese Beeinflussung der katalytischen Eigenschaften durch Feinbauänderungen wird an vier verschiedenen Cu—Pd-Legierungen gefunden.Die Ergebnisse der Messungen werden im Zusammenhang mit anderen Eigenschaften der Legierungen besprochen.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1220-1228 
    ISSN: 0044-2313
    Keywords: Phosphane ; phosphite ; phosphido complexes of vanadium(V) ; syntheses ; 1H, 51V, 31P NMR ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphane, Phosphite, Phosphido, Complexes of Vanadium(V)Complex formation of tert-butylimidovanadium(V)trichloride (1) with phosphanes und phosphites has been studied. Syntheses of phosphidovanadium(V) compounds tC4H9N=VCp(NHtC4H9)[P(SiMe3)2] and tC4H9N=VCp(NiProp2)(PR2) (R=SiMe3, Ph) are described starting from the corresponding chlorovanadium(V) complexes. The reaction of 1 with silver hexafluorophosphate yields a bis(fluoro)phosphidovanadium(IV complex [(μ-PF2)2V2Cl2)(NtC4H9)2]; as primary intermediate product of the unknown redox reaction a cationic vanadium(V) complex [tC4H9N=VCl2 · PPh3]+PF6- has been isolated. 1 reacts with an excess of diisopropylamine forming tC4H9N=V(NiProp2)Cl2 (16); in addition the following diisopropylamido-tert-butylimidovanadium(V) compounds tC4H9N=VCp(NiProp2)Cl (3) and tC4H9N=V(NiProp2)X2 (X=CH2CMe3, OtC4H9, CH3COO) has been prepared. All compounds obtained are characterized by 1H, 51V, 31P NMR spectroscopy. The X-ray diffraction analysis of 16 and 3 indicate a planar coordination sphere of the amido nitrogen atom.
    Notes: Die Komplexbildung des tert-Butylimidovanadium(V)-trichlorids (1) mit Phosphanen und Phosphiten wurde untersucht. Die Darstellung der Phosphidovanadium(V)-Verbindungen tC4H9N=VCp(NHtC4H9)[P(SiMe3)2] und tC4H9N=VCp(NiProp2)(PR2) (R=SiMe3, Ph) wird beschrieben; als Ausgangsverbindungen werden entsprechende Chorovanadium(V)-Komplexe eingesetzt. Die Reaktion von 1 mit Silberhexafluorophosphat führt zu einem Difluorphosphidovanadium(IV)-Komplex [(μ-PF2)2V2Cl2(NtC4H9)2]; als erste Zwischenstufe der unbekannten Redoxreaktion wurde ein kationischer Vanadium(V)-Komplex [tC4H9N=VCl2 · PPh3]+PF6- isoliert. 1 reagiert mit überschüssigem Diisopropylamin unter Bildung von tC4H9N=V(NiProp2)Cl2 (16); weitere Umsetzungen lieferten die Diisopropylamido-tert-butylimido-vanadium(V)-Verbindungen tC4H9N=VCp(NiProp2)Cl (3) und tC4H9N=V(NiProp2)X2 (X=CH2CMe3, OtC4H9, CH3COO). Alle dargestellten Verbindungen werden 1H-, 51V- und 31P-NMR-spektroskopisch charakterisiert. Die Röntgenstrukturanalyse von 16 und 3 zeigt eine planare Koordinationssphäre des Amido-Stickstoffatoms.
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  • 3
    ISSN: 0009-2940
    Keywords: Phosphorus ; Arsenic ; Germanium ; Inorganic heterocycles ; Metal amides ; Fluorinated ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of potassium Rf-amide [Rf = tris(trifluoromethyl)phenyl](2) with PCl3, AsC13, and GeC12 · dioxane yield new four-membered inorganic heterocycles [RfNPCl]2 (3), [RfNAsC1]2 (4), and [RfNGe]2 (5), respectively. On the other hand, the reaction of Rf-amide 2 with two equivalents of RfPCl2 leads to the formation of the imino-γ3-phosphane RfN=PRf (6) and the diamino-γ3-phosphane (RfNH)2PRf (7). The iminophosphane 6 reacts with Ni(CO)2(PPh3)2 and forms the complex [Ni(PPh3)2(RfN=PRf)] (9), in which the imino- phosphane coordinates to the metal through the phosphorus lone pair. Treatment of lithium amide 2 with transition metal chlorides ZnCl2 and FeCl2 yields the imido/amido spirocyclic metal derivatives 9 and 10, respectively. Compounds 3-10 have been extensively characterized by their analytical and mass, IR, and NMR (1H, 19F, and 31P) spectroscopy. Further, the molecular structures of all the compounds have been unambiguously determined by single-crystal X-ray diffraction studies. The diazadigermetidine 5 crystallizes in a fluorescent-yellow orthorhombic and a yellow monoclinic crystal modification. The results obtained reveal the role of Rf, group in stabilizing new multiple bonded systems and inorganic heterocycles. A skeletal rearrangment of the Rf ligand is observed in the reactions leading to compounds 9 and 10. Moreover, the preparation of compounds 9 and 10 indicates the limitation of the use of this ligand in the preparation of new metal-amide systems, especially where the metal atoms have a strong tendency for the formation of strong M—F bonds.
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  • 4
    ISSN: 0009-2940
    Keywords: Cavitand ; Electrochemistry ; Iron sulfur cluster ; Metalloprotein model ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: NMR and Mössbauer spectroscopy show that a novel tetrathiol ligand, based on the cavitand diphenylglycoluril, encapsulates a 4Fe-4S cluster and induces asymmetry in it. The cluster gives a weak electrochemical current response in DMF, with a half-wave potential for the 2-/3- reduction vs. Fc+/Fc of -1.7 V. Ba2+ ions are adsorbed, according to X-ray analysis of the SEM image of the electrode, and act as modulator and promoter of the electrochemical response. On the basis of cyclic voltammograms it is proposed that this adsorption creates electroactive sites, changing the type of diffusion controlling the mass transport to the electrode from radial to linear, and that it helps the negatively charged complex, which contains a dipole, to approach the negative electrode in an orientation favourable for electron exchange. This feature makes the complex an important model for ferredoxins, in spite of a difference in redox potential.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 231 (1937), S. 298-303 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. α-Naphtholsulfonsäure läßt sich an Stelle von Phenolsulfonsäure zur kolorimetrischen Bestimmung kleinster Nitratmengen verwenden.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 221 (1935), S. 391-396 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 223 (1935), S. 17-27 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 7 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1995-2000 
    ISSN: 0044-2313
    Keywords: 2,6-Diisopropylphenyl-, Amino(fluoro)boranes ; Amino-imino-boranes ; Diazadiboretidines ; Diazasilaboretidines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 2,6-Diisopropyl-phenyl Group as a Bulky Substituent in Boron-Nitrogen Compounds. IIFluoro-bis(amino)boranes R′ (Me3Si)N-BF-NHR (R = 2,6-)Me2CH)2C6H3, R′ = Me (Ia), CH2Me (Ib), CHMe2 (Ic), CMe (Id), SiMe3 (Ie), R (If) react with t-butyllithium (molar ratio 1:1) by elimination of HF to give the amino-imino-boranes (IIa - f). The thermal stabilities of the latter depend upon the steric requirement of the substituent R′, IIa - c and IIe dimerize to yield the diazaboretidines IIIa - c and IIIe. IId remains unchanged at 200°C and above, and IIf isomerizes forming the B-Me substituted diazasilaboretidine IVf. If a twofold amount of t-butyllithium is employed, B-CMe3 substituted diazasilaboretidines (Va - f) are the main products. All compounds are characterized by elemental (C, H) analyses and their mass- and n.m.r. (1H, 13C, 15N (in part), 19F, 29Si) spectra. Characteristic i.r.-bands are reported for the amino-imino-boranes (II). An X-ray structure analysis is presented for IVf.
    Notes: Die HF-Eliminierung aus Fluorbis(amino)boranen des Typs R′ (Me3Si)NBFNHR (R = 2,6-)Me2CH)2C6H3, R′ = Me (Ia), CH2Me (Ib), CHMe2 (Ic), CMe3 (Id), SiMe3 (Ie), R (If)) mit t-Butyllithium im Molverhältnis 1:1 führt zu den Amino-imino-boranen (IIa-f), die - abhängig von der Größe des Substituenten R′ - unterschiedliche thermische Stabilität aufweisen. IIa - c und IIe dimerisieren zu den Diazadiboretidinen IIIa - c und IIIe. IId ist bis über 200°C stabil, während sich IIf bei dem Versuch seiner Isolierung zum Bor-Methyl-substituierten Diazasila-boretidin IVf umlagert. Führt man die gleiche Umsetzung mit t-Butyllithium im überschuß (Molverhältnis 1:2) durch, erhält man fast ausschließlich die Bor-t-Butyl-substituierten Diaza-sila-boretidine Va - Vf.Alle Verbindungen sind elementaranalytisch (C, H) und spektroskopisch MS, NMR (1H, 13C, 15N (teilweise), 19F, 29Si) charakterisiert. Charakteristische IR-Banden werden für die Amino-imino-borane (II) angegeben. Eine Röntgenstruktur-analyse wurde von IVf angefertigt.
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  • 9
    ISSN: 0044-2313
    Keywords: sulfenamides ; phosphorus ; pentacoordinated ; X-ray structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaktionen von Sulfenamiden mit Verbindungen des dreiwertigen PhosphorsChlor-dimethylamino-phenyl-p-tolylthio-phosphoniumchlorid 2, Dimethylamino-diphenyl-p-tolylthio-phosphoniumchlorid 3, Bis(diethylamino)-dimethylamino-p-tolylthiophosphoniumchlorid 4 und tert-Butyl-dimethylaminophenyl-p-tolylthiophosphonium-chlorid 5 wurden durch Umsetzung von N,N-Dimethylamino-p-tolylsulfenamid 1 mit PhPCl2, Ph2PCl, (Et2N)2PCl und tBu(Ph)PCl erhalten. Die Reaktion von N,N′-Dimethyl-N,N′-bis(trimethylsilyl)harnstoff 9 und N-Methyl-N′-phenyl-N,N′-bis(trimethylsilyl)harnstoff 10 mit Phenylsulfenylchlorid 6 oder p-Nitrophenylsulfenyl-chlorid 8 ergab die N-Arylthio-N,N′-diorgano-N′-(trimethylsilyl)harnstoffe 11 - 14. Die Umsetzung von 11 - 14 und der bereits bekannten Verbindungen 15 und 16 mit MePCl2, ClCH2PCl2, tBuPCl2 und PhPCl2 führte zur Bildung der 2-(Arylthio)-2-chlor-1,2,3-triorgano-1,3,2λ5-diazaphosphetidin-4-one17 - 26. 1,3-Dimethyl-2-(1,1,1,3,3,3-hexafluor-2-propoxy)-2-phenyl-2-phenylthio-1,3,2λ5-diazaphosphetidin-4-on 29 und die 2-Arylthio-1,3-dimethyl-2-(p-nitrophenoxy)-2-organyl-1,3,2λ5-diazaphosphetidin-4-one 30 - 32 wurden durch Umsetzung der Verbindungen 17, 24 und 27 mit 1,1,1,3,3,3-Hexafluor-2-propanol oder p-Nitrophenol in Anwesenheit von Triethylamin dargestellt. Die Reaktion von 21 mit Thiophenol in Anwesenheit von Triethylamin ergab ein Produktgemisch, aus dem das Spirophosphoran 1,3,4,5,7-Pentamethyl-1,3,5,7-tetraaza-4λ5-phosphaspiro[3.3]heptan-2,6-dion 33 isoliert werden konnte. Identität und Struktur aller neuen Verbindungen wurden durch 1H-, 13C- and 31P-NMR-Spektroskopie und durch Elementaranalyse nachgewiesen. Ein möglicher Mechanismus für die Reaktion von Sulfenamiden mit Verbindungen des dreiwertigen Phosphors wird diskutiert. Für die Verbindungen 5a, 32 und 33 wurden Einkristall-Röntgenstrukturanalysen durchgeführt. Das Kation der Verbindung 5a enthält vierfach-koordinierten Phosphor (nahezu tetraedrische Geometrie) und stellt ein seltenes Beispiel einer P-S-Einfachbindung in einem solchen System dar (P-S 207,37(9) pm). In 32 ist die Geometrie am Phosphor verzerrt trigonal bipyramidal, wobei die axialen Lagen durch Sauerstoff- und Stickstoffatome besetzt sind. Im Spirophosphoran 33 liegt die Geometrie am Phosphor zwischen trigonal bipyramidal und quadratisch pyramidal, mit nahezu planaren Vierringen.
    Notes: Chloro-dimethylamino-phenyl-p-tolylthio-phosphonium chloride 2, dimethylamino-diphenyl-p-tolylthio-phosphonium chloride 3, bis(diethylamino)-dimethylamino-p-tolylthiophosphonium chloride 4 and tert-butyl-dimethylamino-phenyl-p-tolylthio-phosphonium chloride 5 were prepared by the reaction of N,N-dimethylamino-p-tolylsulfenamide 1 with PhPCl2, Ph2PCl, (Et2N)2PCl and tBu(Ph)PCl, respectively. The reaction of N,N′-dimethyl-N,N′-bis(trimethylsilyl)urea 9 and N-methyl-N′-phenyl-N,N′-bis(trimethylsilyl)urea 10 with phenylsulfenyl chloride 6 or p-nitrophenylsulfenyl chloride 8 furnished the N-arylthio-N,N′-diorgano-N′-(trimethylsilyl)-ureas 11 - 14. The reaction of 11 - 14 and of the previously known compounds 15 and 16 with MePCl2, ClCH2PCl2, tBuPCl2 and PhPCl2 resulted in the formation of the 2-arylthio-2-chloro-1,2,3-triorgano-1,3,2λ5-diazaphosphetidin-4-ones 17 - 26. 1,3-Dimethyl-2-(1,1,1,3,3,3-hexafluoro-2-propoxy)-2-phenyl-2-phenylthio-1,3,2λ5-diazaphosphetidin-4-one 29 and the 2-arylthio-1,3-dimethyl-2-(p-nitrophenoxy)-2-organyl-1,3,2λ5-diazaphosphetidin-4-ones 30 - 32 were obtained in the reactions of compounds 17, 24 and 27 with 1,1,1,3,3,3-hexafluoro-2-propanol or p-nitrophenol in the presence of triethylamine. The reaction of compound 21 with thiophenol in the presence of triethylamine resulted in a mixture of products, from which 1,3,4,5,7-pentamethyl-1,3,5,7-tetraaza-4λ5-phosphaspiro[3.3]heptan-2,6-dione 33 was isolated. The identity and structure of all the new compounds were established by 1H-, 13C- and 31P-NMR spectroscopy and by elemental analysis. A possible mechanism of reaction of sulfenamides with compounds of trivalent phosphorus is discussed. For the compounds 5a, 32 and 33 X-ray structure analyses were conducted. The cation of compound 5a involves four-coordinate phosphorus (essentially tetrahedral geometry) and is a rare example of a P-S single bond in such a system (P-S 207.37(9) pm). In 32 the geometry at phosphorus is distorted trigonal bipyramidal, with axial positions occupied by oxygen and nitrogen atoms. In the spirophosphorane 33 the geometry at phosphorus is intermediate between trigonal bipyramidal and square pyramidal, with essentially planar four-membered rings.
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  • 10
    ISSN: 0044-2313
    Keywords: Magnesium compound ; phthalocyanine complex ; crystal structure ; vibrational spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Magnesium Phthalocyanines: Synthesis and Properties of Halophthalocyaninatomagnesate, [Mg(X)Pc2-]- (X = F, Cl, Br); Crystal Structure of Bis(triphenylphosphine)iminiumchloro-(phthalocyaninato)magnesate Acetone SolvateMagnesium phthalocyanine reacts with excess tetra(n-butyl)ammonium- or bis(triphenylphosphine)iminiumhalide ((nBu4N)X or (PNP)X; X = F, Cl, Br) yielding halophthalocyaninatomagnesate ([Mg(X)Pc2-]-; X = F, Cl, Br), which crystallizes in part as a scarcely soluble (nBu4N) or (PNP) complex-salt. Single-crystal X-ray diffraction analysis of b(PNP)[Mg(Cl)Pc2-] · CH3COCH3 reveals that the Mg atom has a tetragonal pyramidal coordination geometry with the Mg atom displaced out of the center (Ct) of the inner nitrogen atoms (Niso) of the nonplanar Pc ligand toward the Cl atom (d(Mg—Ct) = 0.572(3) Å; d(Mg—Cl) = 2.367(2) Å). The average Mg—Niso distance is 2.058 Å. Pairs of partially overlapping anions are present. The cation adopts a bent conformation (b(PNP)+: d(P1—N(K)) = 1.568(3) Å; d(P2—N(K)) = 1.587(3) Å; ∡(P1—N(K)—P2) = 141.3(2)°). Electrochemical and spectroscopic properties are discussed.
    Notes: Magnesiumphthalocyanin reagiert mit überschüssigem Tetra(n-butyl)ammonium- oder Bis(triphenylphosphin)iminiumhalogenid ((nBu4N)X oder (PNP)X; X = F, Cl, Br) zu Halogenophthalocyaninatomagnesat ([Mg(X)Pc2-]-; X = F, Cl, Br), welches teilweise als wenig lösliches (nBu4N)- oder (PNP)-Komplexsalz kristallisiert. Die Kristallstrukturanalyse von b(PNP)[Mg(Cl)Pc2-] · CH3COCH3 bestätigt die tetragonal-pyramidale Koordinationsgeometrie des Mg-Atoms, wobei dieses aus dem Zentrum (Ct) der inneren vier Stickstoffatome (Niso) des nicht-planaren Pc-Liganden in Richtung des Cl Atoms verschoben ist (d(Mg—Ct) = 0,572(3) Å; d(Mg—Cl) = 2,367(2) Å). Der mittlere Mg—Niso-Bindungsabstand beträgt 2,058 Å. Im festen Zustand bilden je zwei Anionen partiell überlappende Dimere. Das Kation liegt in gewinkelter Konformation vor (b(PNP)+: d(P1—N(K)) = 1,568(3) Å; d(P2—N(K)) = 1,587(3) Å; ∡(P1—N(K)—P2) = 141,3(2)°). Elektrochemische und spektroskopische Eigenschaften werden diskutiert.
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