Aluminium selenide

Aluminium selenide[1]
Names
Other names
Aluminium(III) selenide
Identifiers
1302-82-5
ChemSpider 144477 YesY
EC Number 215-110-6
Jmol interactive 3D Image
PubChem 164804
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
not listed
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 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., fluorine Special hazards (white): no codeNFPA 704 four-colored diamond
0
3
3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.[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

  1. ↑ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, FL: 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: 617. doi:10.1107/S0365110X66001506.
  3. 1 2 Waitkins, G. R.; Shutt, R. (1946). "Aluminum Selenide and Hydrogen Selenide". Inorganic Syntheses 2: 183–186. doi:10.1002/9780470132333.ch55.
  4. ↑ 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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