) | |
| Names | |
|---|---|
| Other names Aluminium(III) selenide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.013.737  |
| EC Number |
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PubChem CID | |
| UNII | |
CompTox Dashboard (EPA) | |
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SMILES
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| Properties | |
| Al2Se3 | |
| Molar mass | 290.84 g/mol |
| Appearance | yellow to brown powder |
| Odor | odorless |
| Density | 3.437 g/cm3 |
| Melting point | 947 °C (1,737 °F; 1,220 K) |
| decomposes | |
| Structure | |
| Monoclinic, mS20, Space group Cc, No. 9[2] | |
| Thermochemistry | |
Std molar entropy (S | 154.8 J/mol K |
Std enthalpy of formation (ΔfH⦵298) | -566.9 kJ/mol |
| Hazards | |
| GHS pictograms | ) ) ) |
| GHS Signal word | Danger |
GHS hazard statements | H301, H331, H373, H400, H410 |
GHS precautionary statements | P260, P261, P264, P270, P271, P273, P301+310, P304+340, P311, P314, P321, P330, P391, P403+233, P405, P501 |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Aluminium selenide is the inorganic compound with the formula Al2Se3.
Preparation
It is a solid prepared by igniting a mixture of the elements at 1,000 °C (1,830 °F):
- 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
Uses
Al2Se3 has been used as a precursor to hydrogen selenide, which is released when the solid is treated with acids.[3]
Safety
Aluminium selenide should be stored and handled away from moisture and air.
References
- ^ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–40. ISBN 0-8493-0594-2.
- ^ Steigmann, G. A.; Goodyear, J. (1966). "The crystal structure of Al2Se3". Acta Crystallographica. 20 (5): 617. doi:10.1107/S0365110X66001506.
- ^ a b Waitkins, G. R.; Shutt, R. (1946). "Aluminum Selenide and Hydrogen Selenide". Inorganic Syntheses. Inorganic Syntheses. 2: 183–186. doi:10.1002/9780470132333.ch55. ISBN 9780470132333.
- ^ Langner, Bernd E. (2005) "Selenium and Selenium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim. doi:10.1002/14356007.a23_525