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Silicon Chloroitydrosulphide, SiCl3SH

It has been seen under silicon thiochloride that silicon chlorohydrosulphide is an intermediate product of the interaction of silicon tetrachloride and hydrogen sulphide. This compound is therefore formed by passing a mixture of silicon tetrachloride vapour and hydrogen sulphide through a tube at a lower temperature than that required for preparing silicon thiochloride. It is separated from unchanged silicon tetrachloride by fractional distillation and condensation in a freezing mixture. It is a colourless, fuming liquid, of density 1.43 at 15° C., which boils at 96° C. Friedel and Ladenburg found its vapour density between 155° C. and 161° C. to be 5.74 and 5.24-5.32, theory requiring 5.83 (air = 1). It is decomposed by water with separation of silicic acid and evolution of hydrogen chloride and sulphide; bromine forms hydrogen bromide and SiCl3Br, and alcohol the compound Si(OC2H5)3SH.

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