Silicon monosulfide

Yellow solid

Fixed

1.85 g · cm -3

940 ° C.

1090 ° C

Decomposition in water

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Silicon monosulfide is an inorganic chemical compound of silicon selected from the group of the sulfides.

Occurrence

Silicon monosulfide was detected in interstellar space.

Production and representation

Silicon monosulfide can be obtained by reaction of silicon with the 1.1 -fold stoichiometric amount of sulfur at 650 to 700 ° C, but also to larger pieces Siliciumdisulfid formed.

Alternatively, it may also be obtained by comproportionation of Siliciumdisulfid and silicon at 850 ° C in the monomeric form or by reaction of silicon with carbon at 1000 ° C or with iron ( II ) sulphide at 1200 ° C.

Properties

Silicon monosulfide is a yellow, polymeric, amorphous, metastable substance decomposes by slightest traces of moisture. Can be obtained in two forms, wherein the fibrous form, is more reactive than the vitreous. The former sometimes spontaneously disproportionates under visual glow and whitening. Above about 650 ° C, the rate of disproportionation to Siliciumdisulfid and silicon markedly.