Aluminium selenide[1]
Aluminum selenide
Names
Other names
Aluminium(III) selenide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.737 Edit this at Wikidata
EC Number
  • 215-110-6
UNII
  • InChI=1S/2Al.3Se/q2*+3;3*-2 checkY
    Key: CYRGZAAAWQRSMF-UHFFFAOYSA-N checkY
  • InChI=1/2Al.3Se/q2*+3;3*-2
    Key: CYRGZAAAWQRSMF-UHFFFAOYAJ
  • [Al+3].[Al+3].[Se-2].[Se-2].[Se-2]
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
154.8 J/mol K
-566.9 kJ/mol
Hazards
GHS labelling:
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
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)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 3: Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked. E.g. hydrogen peroxideSpecial hazards (white): no code
3
0
3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

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 are usually protected from moisture, because they hydrolyze readily, giving off highly toxic hydrogen selenide gas:[4]

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.[3]

References

  1. ^ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–40. ISBN 0-8493-0594-2.
  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.
  3. ^ 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.
  4. ^ Langner, Bernd E. (2005) "Selenium and Selenium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim. doi:10.1002/14356007.a23_525
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