Silicon sulfide
| Silicon sulfide | |
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silicon(IV) sulfide |
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Other names
silicon disulfide |
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| Identifiers | |
| CAS number | 13759-10-9  |
| PubChem | 83705 |
| ChemSpider | 75527  |
| Jmol-3D images | Image 1 |
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| 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 |
1,090 °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
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| Related compounds | |
| Other anions | silicon dioxide |
| Other cations | carbon disulfide germanium disulfide tin(IV) sulfide lead(IV) sulfide |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| 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
- ^ Weiss A. (1954). "Zur Kenntnis der faserigen Siliciumdioxyd-Modifikation". Zeitschrift fuer Anorganische und Allgemeine Chemie 276: 95–112. doi:10.1002/zaac.19542760110.
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
- ^ Goebel, J. H., "SiS2 in Circumstellar Shells," Astronomy and Astrophysics, 278, 226 (1993).
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