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  • Inorganic Chemistry  (5)
  • 1995-1999  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 1137-1139 
    ISSN: 0009-2940
    Keywords: Tetraindane(4) ; Indium(I) ; Mn-Mn bond ; Indium alkyl bridge ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tetrahedra-tetrakis[tris(trimethylsilyl)methyl]tetraindane(4) (1) reacts with decacarbonyldimanganese(0) to yield the bright red crystalline title compound 2, in which two carbonyl ligands are replaced by two InR fragments. The crystal structure determination of 2 shows two Mn(CO)4 groups (Mn-Mn 313.7 pm) bridged by two monoalkylindium units and a planar Mn2In2 molecular center.
    Additional Material: 1 Ill.
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  • 2
    ISSN: 0009-2940
    Keywords: Tetraindane(4) ; Indium(I) ; Co—Co bond ; Indium alkyl bridge ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: tetrahedra-Tetrakis[tris(trimethylsilyl)methyl]tetraindane(4) (1) reacts with octacarbonyldicobalt to yield two products, depending on the stoichiometric ratio of the starting compounds: By replacement of one bridging carbonyl group a dicobalt monoindium derivative 2 is formed, which contains a Co—Co bond [256.81(5) pm] bridged by one carbonyl and one monoalkylindium group. While 2 is a monomer in benzene solutions, it dimerizes in the solid state by an interaction of the oxygen atom of the bridging carbonyl group to the coordinatively unsaturated In atom of a second molecule across a center of symmetry. Another compound (3) is formed by the replacement of both bridging carbonyl ligands, which exhibits a strongly distorted Co2In2 tetrahedron with normal Co—In bond lengths of 253.44(6) pm, but long Co—Co [280.14(6) pm] and In—In distances [336.18(6) pm].
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 823-828 
    ISSN: 0044-2313
    Keywords: Al—Al bond ; insertion reaction with tert-butyl isocyanide ; trimeric cyano dialkyl alane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of the Trimeric [(Me3Si)2CH]2Al—CNTetrakis[bis(trimethylsilyl)methyl]dialane(4) 1 with an Al—Al bond reacts with tert-butyl isocyanide in the molar ratio of 1:2 within three days to give a mixture of several unknown products, from which the title compound 4 is isolated in a 26% yield by recrystallization from n-pentane. 4 is a trimer in the solid state via Al—C≡N—Al bridges showing a nine-membered Al3C3N3 heterocycle in a boat conformation. In contrary to the reaction with phenyl isocyanide the expected dark red product of the twofold insertion into the Al—Al bond under formation of a carbon-carbon single bond is detected only spectroscopically as a minor by-product.
    Notes: Tetrakis[bis(trimethylsilyl)methyl]dialan(4) 1 mit Al—Al-Bindung reagiert mit tert-Butylisocyanid im Molverhältnis 1:2 im Laufe von drei Tagen unter Bildung eines unübersichtlichen Produktgemisches, aus dem sich in 26% Ausbeute durch Umkristallisieren aus n-Pentan farblose Kristalle der Titelverbindung 4 isolieren lassen. Wie die Bestimmung der Kristallstruktur ergibt, liegt 4 im Festkörper als Trimeres mit Al—C≡N—Al-Brücken vor, und der sich ausbildende neungliedrige Al3C3N3-Heterozyklus weicht leicht von der Planarität unter Ausbildung einer Wannenkonformation ab. Das mit Phenylisontril hauptsächlich gebildete Produkt der zweifachen Insertion in die Al—Al-Bindung unter Knüpfung einer C—C-Einfachbindung wird hier nur in verunreinigter Form spektroskopisch nachgewiesen.
    Additional Material: 2 Ill.
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  • 4
    ISSN: 0044-2313
    Keywords: Aluminium ; indium ; Al—Al bond ; In—In bond ; benzoato bridges ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reactions of R2Al—AlR2 and R2In—InR2 with Benzoic Acid - Synthesis and Crystal Structure of R2Al(μ-H)(μ-O2C—C6H5)AlR2 and RIn(μ-O2C—C6H5)4InR [R = CH(SiMe3)2]Tetrakis[bis(trimethylsilyl)methyl]dialane(4) 1 reacts with benzoic acid by the oxidative cleavage of the Al—Al bond: The Al atoms are inserted into the O—H bond of the acid and the proton is reduced to a hydride anion. As shown by a crystal structure determination, the product 4 shown an unprecedented structure with both dialkylaluminium fragments unsymmetrically bridged by the hydrogen atom and a benzoato group. 4 can be described as a model compound for the first step of the hydrolysis of compounds with low-valent Al atoms as well as elemental aluminium itself. The diindane(4) analogue of 1 (2) and benzoic acid yield, however, elemental indium and mixed alkyl benzoato indium derivatives, from which bis(trimethylsilyl)methyldi(benzoato)indium 9 has been characterized by a crystal structure determination. 9 consists of a dimer with a remarkable cage structure, in which both monoalkylindium groups are interconnected by four benzoato-O,O′ bridges.
    Notes: Tetrakis[bis(trimethylsilyl)methyl]dialan(4) 1 reagiert mit Benzoesäure unter oxidativer Öffnung der Al—Al-Bindung, wobei sich formal die Al-Atome in die O—H-Bindung der Säure einschieben und das Proton zu einem Hydridion reduzieren. Die beiden Dialkylaluminium-Fragmente des daraus erhaltenen Produkts 4 werden, wie durch Kristallstrukturbestimmung gezeigt wird, in bisher unbekannter Weise durch das Wasserstoffatom und eine Benzoatogruppe unsymmetrisch miteinander verbrückt. 4 läßt sich als Modellverbindung für die erste Stufe der Hydrolyse von Derivaten mit niederwertigen Al-Atomen und elementarem Aluminium beschreiben. Das zu 1 analoge Diindan(4) 2 ergibt dagegen mit Benzoesäuren unter Abscheidung von elementarem Indium gemischte Alkyl-benzoatoindium-Verbindungen. Bis(trimethylsilyl)methyl-di(benzoato)indium 9 wird kristallstrukturanalytisch untersucht; es liegt als Dimeres mit einer Käfigstruktur vor, in der zwei Monoalkylindium-Reste über vier Benzoato-O,O′-Brücken miteinander verbunden werden.
    Additional Material: 2 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: Phosphorane Iminato Complexes of Sulfur ; Syntheses ; IR Spectra ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorane Iminato Complexes of Sulfur. Syntheses and Crystal Structures of [O3SS(NPPh3)2] · CH3CN, [SO(NPPh3)2], and [SCl(NPMe3)2]ClThe title compounds have been prepared by the reaction of Me3SiNPPh3 with SO2 and SOCl2, respectively, and by the reaction of Me3SiNPMe3 with S2Cl2. They form colourless, moisture sensitive crystals, which were characterized by IR spectroscopy and by crystal structure determinations.[O3SS((NPPh3)2)] · CH3CN: Space group Pca21, Z = 4, structure solution with 4016 observed unique reflections, R = 0.050. Lattice dimensions at -60°C: a = 1865.1, b = 1168.4, c = 1569.0 pm. The compound has a zwitterionic structure with a S—S bond length of 218.2 pm and bond lengths S—N of 161.2 and P—N of 160.1 pm.[SO(NPPh3)2]: Space group P21/c, Z = 4, structure solution with 2854 observed unique reflections, R = 0.113. Lattice dimensions at -50°C: a = 1173.1, b = 1585.6, c = 1619.2 pm, b̃ = 98.13°. The compound forms monomeric molecules, in which the positions of S and N atoms are disordered in two positions. The bond lengths are S—N 166 pm and P—N 163 pm in average.[SCl(NPMe3)2]Cl: Space group P1, Z = 2, structure solution with 2416 observed unique reflections, R = 0.038. Lattice dimensions at 20°C: a = 613.2, b = 1030.3, c = 1111.4 pm, α = 88.48°, b̃ = 88.01°, γ = 83.10°. The compound forms ions [SCl(NPMe3)2]+ and Cl-. In the cation the sulfur atom is φ-tetrahedrally coordinated with a long S—Cl distance of 246.9 pm and bond lengths S—N of 155.3 pm and P—N of 164.3 pm in average.
    Notes: Die Titelverbindungen entstehen durch Umsetzung von Me3SiNPPh3 mit Schwefeldioxid bzw. mit Thionylchlorid und von Me3SiNPMe3 mit Dischwefeldichlorid als farblose, feuchtigkeitsempfindliche Kristalle, die wir durch die IR-Spektren und durch Kristallstrukturanalysen charakterisiert haben.[O3SS(NPPh3)2)] · CH3CN: Raumgruppe Pca21, Z = 4, Strukturlösung mit 4016 unabhängigen beobachteten Reflexen, R = 0,050. Gitterabmessungen bei -60°C: a = 1865,1; b = 1168,4; c = 1569,0 pm. Die Verbindung hat eine zwitterionische Struktur mit einer S—S-Bindungslänge von 218,2 pm und Abständen S—N von 161,2 pm und P—N von 160,1 pm.[SO(NPPh3)2]: Raumgruppe P21/c, Z = 4, Strukturbestimmung mit 2854 unabhängigen beobachteten Reflexen, R = 0,113. Gitterabmessungen bei -50°C: a = 1173,1; b = 1585,6; c = 1619,2 pm, b̃ = 98,13°. Die Verbindung hat eine monomere Molekülstruktur, deren S- und N-Atomlagen in zwei Positionen fehlgeordnet sind. Die Bindungslängen betragen im Mittel für S—N 166 pm und für P—N 163 pm.[SCl(NPMe3)2]Cl: Raumgruppe P1, Z = 2, Strukturlösung mit 2416 unabhängigen beobachteten Reflexen, R = 0,038. Gitterabmessungen bei 20°C: a = 613,2; b = 1030,3; c = 1111,4 pm, α = 88,48°; b̃ = 88,01°; γ = 83,10°. Die Verbindung besteht aus Ionen [SCl(NPMe3]2+ und Cl-. Im Kation ist das Schwefelatom φ-tetraedrisch koordiniert mit einem S—Cl-Abstand von 246,9 pm und mittleren Bindungslängen S—N von 155,3 pm und P—N von 164,3 pm.
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