Silicon sulfide

Silicon sulfide

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OtherNames = silicon disulfide
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CASNo = 13759-10-9
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Formula = SiS2
MolarMass = 92.218 g/mol
Appearance = white, grey, or brown needels rotten egg smell in moist air
Density = 1.853 g/cm3
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Boiling_notes = 1090 °C (1360 K) sublimes
Solubility = decomposes
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CrystalStruct = orthorhombic, rhombohedral
Coordination = tetrahedral
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Section8 = Chembox Related
OtherAnions = silicon dioxide
OtherCations = carbon disulfide germanium disulfide tin(IV) sulfide lead(IV) sulfide
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Silicon sulfide refers to the chemical compound with the formula SiS2. This material is polymeric and adopts a structure quite different from the corresponding silicon dioxide polymorphs. The material consists of chains of edge-shared tetrahedra, Si(μ-S)2Si(μS)2 etc. The Si---Si distances at 214 picometers are shorter than conventional Si-Si single bonds. [Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.]

The material is formed by heating silicon and sulfur or by the exchange reaction between SiO2 and Al2S3. Like all silicon sulfur-compounds, SiS2 hydrolyzes readily to release H2S and form hydrated silica gel.

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