Английская Википедия:Hexachlorodisilane
Hexachlorodisilane is the inorganic compound with the chemical formula Si2Cl6.[1] It is a colourless liquid that fumes in moist air. It has specialty applications in as a reagent and as a volatile precursor to silicon metal.
Structure and synthesis
The molecule adopts a structure like ethane, with a single Si-Si bond length of 233 pm.[2]
Hexachlorodisilane is produced in the chlorination of silicides such as e.g. calcium silicide. Idealized syntheses are as follows:[3]
- CaSi2 + 4 Cl2 → Si2Cl6 + CaCl2
Reactions and uses
Hexachlorodisilane is stable under air or nitrogen at temperatures of at least up to 400°C for several hours, but decomposes to dodecachloroneopentasilane and silicon tetrachloride in presence of Lewis bases even at room temperature.[4]
- 4 Si2Cl6 → 3 SiCl4 + Si5Cl12
This conversion is useful in making silicon-based components of use in semiconducting devices including photovoltaic cells.[1]
The compound is also useful reagent for the deoxygenation reactions, such as this general process involving a phosphine oxide:
- 2 Si2Cl6 + OPR3 → OSi2Cl6 + PR3
References
- ↑ 1,0 1,1 Simmler, W. "Silicon Compounds, Inorganic", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH. Шаблон:Doi
- ↑ T.L. Cottrell, "The Strengths of Chemical Bonds," 2nd ed., Butterworths, London, 1958
- ↑ Шаблон:Cite journal
- ↑ Emeleus, H. J., and Muhammad Tufail. "Reaction of Hexachlorodisilane with Bases and Alkyl Halides." Journal of Inorganic and Nuclear Chemistry 29.8 (1967): 2081-084
