infrared spectral data, vapour density measurements and analytical data. Both hexafluorodisilane and hexachlorodisilane are found to react with sulfurtrioxide when heated to 400°C for 12 h. The products of reaction are silicon tetrafluoride, silica and sulfur dioxide with hexafluorodisilane while hexachlorodisilane in addition gives rise to hexachlorodisiloxane.
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
Reactions of Si<sub>2</sub>Br<sub>6</sub>with N-Heterocyclic Carbenes
作者:Julia I. Schweizer、Alexander G. Sturm、Timo Porsch、Matthias Berger、Michael Bolte、Norbert Auner、Max C. Holthausen
DOI:10.1002/zaac.201800163
日期:2018.9.17
A combined experimental and theoretical study on the reaction of Si2Br6 with N‐heterocycliccarbenes is reported. Employment of an imidazole‐2‐ylidene with methyl groups in C4‐ and C5‐position results in the disproportionation of Si2Br6 into the adducts NHC→SiBr2 and NHC→SiBr4. According to expectation, the hydrogenated derivative 1,3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene forms analogous disproportionation
Hexabromodisilane reacts with sulphur trioxide at roomtemperature to give pure siliconsesquioxide in almost quantitative yield, together with bromine and sulphur dioxide as the only by-products.
Flash photolysis of SiBr4: the UV spectrum of SiBr2
作者:B. Ruzsicska、A. Jodhan、I. Safarik、O.P. Strausz、T.N. Bell
DOI:10.1016/0009-2614(87)80153-7
日期:1987.8
flash photolysis of SiBr4 both the absorption and the emission spectra corresponding to the B̃2Σ−X̃2Π transition of SiBr have been observed. A broad, structureless absorption band has also been detected in the 340–400 nm region which could be assigned to the hitherto unreported à 1B1−x̃ 1A1transition of SiBr2. The decay of both absorption spectra followed first-order kinetics yielding the pseudo-first-order
在SIBR的闪光光解4二者的吸收和对应于B的发射光谱2 Σ-X 2 ΠSIBR的过渡已经观察到。一个广泛的,无结构的吸收带也已在340-400纳米的区域,该区域可以被分配给迄今未报告检测到的1乙1 -x 1阿1个SIBR的过渡2。两个吸收光谱的衰减均遵循一级动力学,从而得出伪一级速率常数:k(SiBr)= 2.6×10 4 s -1和k(SiBr 2)= 8.9×10 3 -1。假设消费这些中间体的主要反应是SIBR + SIBR 4 →的Si 2溴5和SIBR 2 + SIBR 4 →的Si 2溴6,二阶速率常数具有值ķ(SIBR)= 9.7×10 9中号- 1 s -1和k(SiBr 2)= 3.3×10 8 M -1 s -1。