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  • 1
    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
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 10 (1996), S. 83-99 
    ISSN: 0268-2605
    Keywords: laser ; chemical vapour deposition ; thin films ; Si/C/H materials ; silacyclobutane ; 1,3-disilacyclobutane ; silicon carbide ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: CO2 laser-induced infrared multiphoton decomposition (IRMPD) and SF6 photosensitized decomposition (LPD) of silacyclobutane (SCB) and 1,3-disilacyclobutane (DSCB) in the gas phase results in the very efficient deposition of Si/C/H and SiC materials, and it is inferred that the process is dominated by formation of transient silene; silene rearrangement to methylsilylene; silene and methylsilylene dehydrogenation; and polymerization of SiCHn (n 〈 4) species. The deposits are sensitive to oxygen.Decomposition and SiC formation are favoured with IRMPD experiments conducted with high-energy fluxes. The laser technique is promising for low-temperature chemical vapour deposition of amorphous SiC.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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