Silicon sulfide
IUPAC name	silicon(IV) sulfide
Other names	silicon disulfide
Identifiers
CAS number	13759-10-9
PubChem	83705
Properties
Molecular formula	SiS2
Molar mass	92.218 g/mol
Appearance	white (samples are sometimes grey or brown) needles rotten egg smell in moist air
Density	1.853 g/cm3
Melting point	1090 °C (sublimes)
Solubility in water	decomposes
Structure
Crystal structure	orthorhombic, oI12
Space group	Ibam, No.72[1]
Coordination geometry	tetrahedral
Hazards
NFPA 704	2 2 3
Related compounds
Other anions	silicon dioxide
Other cations	carbon disulfide germanium disulfide tin(IV) sulfide lead(IV) sulfide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Silicon sulfide is the inorganic compound with the formula SiS₂. Like the silicon dioxide, this material is polymeric but it adopts a 1-dimensional structure quite different from the usual forms of SiO₂.

[edit] Synthesis, structure, and properties

The material is formed by heating silicon and sulfur or by the exchange reaction between SiO₂ and Al₂S₃. The material consists of chains of edge-shared tetrahedra, Si(μ-S)₂Si(μS)₂ etc. Curiously, the Si---Si distances at 214 picometers are shorter than conventional Si-Si single bonds.^[2]

Like other silicon sulfur-compounds, e.g. bis(trimethylsilyl)sulfide, SiS₂ hydrolyzes readily to release H₂S.

SiS₂ is thought to occur in certain interstellar objects.^[3]

[edit] References

[edit] External links

v • d • e   Silicon compounds SiBr4 · SiC · SiCl4 · SiF4 · SiI4 · SiO · SiO2 · SiS2 · Si3N4

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