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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 608 (1992), S. 131-134 
    ISSN: 0044-2313
    Keywords: Tetrahetero-tetrahedrane anions ; G44-, Sn44; ; infrared, Raman spectra; ; internal vibrations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Internal Vibration of the Tetrahetero-Tetrahedrane Anions Ge44-, Sn44-, and Pb44The Frequencies of the internal vibrations ν1 (A1), ν2(E), ν3(T2) of the tetrahetero-tetrahedrane an ions Ge44- and Sn44- are determined from the infrared and Raman spectra of K7LiGe8 and KSn, respectively. A comparison of the characteristic vibration of tetrahedrane anions X44- (X = Si, Ge, Sn)and the isoelectronic neutral tetrahedranes Y4 of the neighbouring elements (Y = P, As, Sb) shows a rather constant ratio of the corresponding frequencies k = v˜(X44-) = 0,77. This allows for an estimate of v˜(Pb44-) from the known Bi4data. In the inflated spectrum of KPb bands are observed in the predicted frequency range.
    Notes: Aus den Infrarot-und Raman-Spektren von K7LiGe8 und KSn werden die Frequenzen der inneren Schwingungen ν1(A1), ν2(E) und ν3(T3) der Tetrahetero-Tetrahedran -Anionen Ge44- und Sn44- bestimmt. Der Vergleich der charakteristischen Schwingungen von Tetrahedran-Anionen X44-(X = Si, Ge, Sn) und isoelektronischen neutralen Tetrahedranen Y4 der Nachbarelemente (Y = P,As, Sb)ergibt ein nahezu konstantes Verhältnis für die einander entsprechenden Frequenzen k = v˜(X44-)/v˜(Y4) = 0,77. Damit werden aus den Frequenzen v˜(Bi4) Werte für v˜(Pb44-) abgeschätzt, welche mit Banden im Infrarot-Spektrum von KPb übereinstimmen.
    Additional Material: 3 Ill.
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  • 2
    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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