Aluminium selenide
Appearance
(Redirected from Al2Se3)
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Names | |
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Other names
Aluminium(III) selenide
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.013.737 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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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⦵298) |
154.8 J/mol K |
Std enthalpy of
formation (ΔfH⦵298) |
-566.9 kJ/mol |
Hazards | |
GHS labelling: | |
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Danger | |
H301, H331, H373, H410 | |
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 [77 °F], 100 kPa).
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Aluminium selenide is the inorganic compound with the formula Al2Se3.
Preparation
[edit]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 are usually protected from moisture, because they hydrolyze readily, giving off highly toxic hydrogen selenide gas:[4]
- Al2Se3 + 3 H2O → Al2O3 + 3 H2Se
Use
[edit]Al2Se3 has been used as a precursor to hydrogen selenide, which is released when the solid is treated with acids.[3]
References
[edit]- ^ 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.
- ^ a b 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