Aluminium selenide
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| Aluminium selenide[1] | |
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Other names
Aluminium(III) selenide |
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| Identifiers | |
| CAS number | 1302-82-5 |
| PubChem | 164804 |
| ChemSpider | 144477  |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | Al2Se3 |
| Molar mass | 290.84 g/mol |
| Appearance | yellow to brown powder |
| Density | 3.437 g/cm3 |
| Melting point |
960 °C |
| Solubility in water | decomposes |
| Structure | |
| Crystal structure | Monoclinic, mS20, Space group Cc, No. 9[2] |
| Hazards | |
| EU classification | not listed |
| NFPA 704 |
 0
3
3
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 (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 | |
Aluminium selenide is the inorganic compound with the formula Al2Se3.
It is a solid prepared by igniting a mixture of the elements:
- 2 Al + 3 Se → Al2Se3
The pure compound is white, but typical samples are coloured.[3] Samples of aluminium selenide must be protected from moisture, because the compound hydrolyzes readily, giving off highly toxic hydrogen selenide gas:[4]
- Al2Se3 + 3 H2O → Al2O3 + 3 H2Se
Al2Se3 has been used as a precursor to hydrogen selenide, which is released when the solid is treated with acids.[3]
[edit] Safety
Aluminium selenide should be stored and handled away from moisture and air.
[edit] References
- ^ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, FL: CRC Press. pp. 4–40. ISBN 0-8493-0594-2
- ^ Steigmann, G. A.; Goodyear, J. (1966). "The crystal structure of Al2Se3". Acta Crystallographica 20: 617. doi:10.1107/S0365110X66001506.
- ^ a b G. R. Waitkins, R. Shutt "Aluminum Selenide and Hydrogen Selenide" Inorganic Syntheses, 1946, vol. 2, pp. 183–186. doi:10.1002/9780470132333.ch55
- ^ Bernd E. Langner "Selenium and Selenium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a23_525.
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