Aluminum Selenide

Title: Aluminum Selenide
CAS Registry Number: 1302-82-5
Molecular Formula: Al2Se3
Molecular Weight: 290.84
Percent Composition: Al 18.55%, Se 81.45%
Literature References: Prepn from aluminum and selenium: Waitkins, Shutt, Inorg. Synth. 2, 184 (1946); Becher in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 825.
Properties: Yellowish to light-brown powder. d415 3.437. Unstable in air. Decomp in water and acid.
Density: d415 3.437
Use: In prepn of hydrogen selenide; in semiconductor research.
Aluminum Silicate Aluminum Sodium Sulfate Aluminum Stearate Aluminum Subacetate Solution Aluminum Sulfate

Aluminium selenide[1]
Aluminum selenide
CAS number 1302-82-5
PubChem 164804
ChemSpider 144477 YesY
Jmol-3D images Image 1
Molecular formula Al2Se3
Molar mass 290.84 g/mol
Appearance yellow to brown powder
Density 3.437 g/cm3
Melting point 960 °C
Solubility in water decomposes
Crystal structure Monoclinic, mS20, Space group Cc, No. 9[2]
EU classification not listed
NFPA 704
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Aluminium selenide is the inorganic compound with the formula Al2Se3.

It is a solid prepared by igniting a mixture of the elements:

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

Al2Se3 has been used as a precursor to hydrogen selenide, which is released when the solid is treated with acids.[3]