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| Names | |
|---|---|
| Other names Aluminium(III) selenide | |
| Identifiers | |
| CAS Number | |
| 3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.013.737 
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| EC Number |
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| PubChem CID | |
| UNII | |
| CompTox Dashboard (EPA) | |
InChI
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SMILES
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| Properties | |
| Chemical formula | Al2Se3 |
| Molar mass | 290.84 g/mol |
| Appearance | yellow to brown powder |
| Odor | odorless |
| Density | 3.437 g/cm |
| Melting point | 947 °C (1,737 °F; 1,220 K) |
| Solubility in water | decomposes |
| Structure | |
| Crystal structure | Monoclinic, mS20, Space group Cc, No. 9 |
| Thermochemistry | |
| Std molar entropy (S298) |
154.8 J/mol K |
| Std enthalpy of formation (ΔfH298) |
-566.9 kJ/mol |
| Hazards | |
| GHS labelling: | |
| Pictograms |   
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| Signal word | Danger |
| Hazard statements | H301, H331, H373, H410 |
| Precautionary statements | P260, P261, P264, P270, P271, P273, P301+P310, P304+P340, P311, P314, P321, P330, P391, P403+P233, P405, P501 |
| NFPA 704 (fire diamond) |
 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).
 Y verify (what is ?)
Infobox references
| |
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. Samples are usually protected from moisture, because they hydrolyze readily, giving off highly toxic hydrogen selenide gas:
- Al2Se3 + 3 H2O → Al2O3 + 3 H2Se
Use
Al2Se3 has been used as a precursor to hydrogen selenide, which is released when the solid is treated with acids.
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. Bibcode:1966AcCry..20..617S. doi:10.1107/S0365110X66001506.
- ^ Waitkins, G. R.; Shutt, R. (1946). "Aluminum Selenide and Hydrogen Selenide". Inorganic Syntheses. Vol. 2. pp. 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
| Aluminium compounds | |||||
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| Al(I) |
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| Al(II) | |||||
| Al(III) |
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