About Aluminium Selenide (Al2Se3)
Performance
Aluminium selenide is the inorganic compound with the formula Al2Se3.
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 of aluminium selenide must be protected from moisture, because the compound hydrolyzes readily, giving off highly toxic hydrogen selenide gas:
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.
Safety
Aluminium selenide should be stored and handled away from moisture and air.
Base infomation
Other names:Aluminium(III) selenide
CAS Number:1302-82-5
ChemSpider:144477 Yes
EC Number:215-110-6
PubChem:164804
Chemical formula:Al2Se3
Molar mass:290.84 g/mol
Appearance:yellow to brown powder
Odor:odorless
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Density:3.437 g/cm3l
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 (So298):154.8 J/mol K
Std enthalpy of formation (ΔfHo298):-566.9 kJ/mo |
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