(F3SiS)2SiF2. Diese Fluorsilylsulfane haben eine bemerkenswert unterschiedliche thermische Stabilitat. Wahrend sich (F3SiS)2SiF2 bereits bei Raumtemperatur zersetzt, ist das bei dieser Temperatur stabile (F3Si)2S eine vielseitige Ausgangsverbindung zur Synthesevon F3Si-Derivaten. Das Silylsulfan F3SiSH konnte neben F3SiBr durch selektive Spaltung einer SiS-Bindung von flussigem (F3Si)2S mit HBr in reiner
in an Ar matrix. Furthermore, 1 has been obtained by co-deposition of SiS and F2/Ar and by pyrolysis of a matrix-isolated SiS2–XeF2 complex under cryogenic conditions. All six vibrational fundamentals of 1 have been observed in the matrix IR spectrum. Ab initio calculations at the MP2 and CCSD(T) levels using large basis sets have been performed. These calculations have guided the detection of 1 and
Silicondifluoride reacts with CF3I to give mainly CF3SiF2I. Other products are CF3SiF2SiF2I, SiF3SiF2I, SiF3SiF2SiF2I, SiF2ISiF2I and SiF2ISiF2SiF2I. The mass spectra and NMR spectra of these compounds are described and also the i.r. spectrum of CF3SiF2I is reported. A reaction mechanism which accounts for these products is proposed.
Reaction of silicon difluoride with halogens: a reinvestigation
作者:Bettadapura S. Suresh、James Charlton Thompson
DOI:10.1039/dt9870001123
日期:——
Reactions of SiF2 with halogens have been reinvestigated by both co-condensation and gas-phase methods. The co-condensation method yields a number of fluorohalogenosilanes including mono-, di-, and higher silane derivatives. These compounds contain SiF, SiF2, and SiF3 units. The reactivity towards SiF2 decreases from chlorine through bromine to iodine. While chlorine and bromine give rise to a number