Aluminium sulfide
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| Aluminium sulfide | |
|---|---|
| Image:Aluminium sulfide.jpg | |
| General | |
| Other names | Aluminium monosulfide |
| Molecular formula | Al2S3 |
| Molar mass | 150.158076 g/mol |
| Appearance | colorless |
| CAS number | [1302-81-4] |
| Properties | |
| Density and phase | 2.0 g/cm3, solid |
| Solubility in water | decomposes |
| Solubility in other solvents | none |
| Melting point | 1100°C |
| Boiling point | 1500 °C (sublimes) |
| Hazards | |
| EU classification | not listed |
| NFPA 704 |    |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
Aluminium sulfide is the name for the chemical compound with the formula Al2S3. This colorless species has an interesting structural chemistry, existing in three different forms. The material is sensitive to moisture, hydrolyzing readily to hydrated aluminium oxides/hydroxides.[1]
Unlike Al2O3, in which the Al(III) centers occupy octahedral holes, the more expanded framework of Al2S3 stabilizes the Al(III) centers into one third of the tetrahedral holes of a hexagonally close-packed arrangement of the sulfide anions. At higher temperature, the Al(III) centers become randomized to give a "defect wurzite" structure. And at still higher temperatures stabilize the γ-Al2S3 forms, with a structure akin to γ-Al2O3.
Molecular derivatives of Al2S3 are not known. Mixed Al-S-Cl compounds are however known. Also Al2Se3 and Al2Te3 are also known.
[edit] References
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
[edit] External links
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Its human toxicity is not stablished and it´s deduced from another sulfides and from its reactivity to other compounds.
