Aluminium selenide

Aluminium selenide

Aluminum selenide
Names
Other names Aluminium(III) selenide
Identifiers
CAS Number	1302-82-5
ChemSpider	144477 Y
EC Number	215-110-6
Jmol 3D model	Interactive image
PubChem	164804
InChI InChI=1S/2Al.3Se/q2*+3;3*-2 Y Key: CYRGZAAAWQRSMF-UHFFFAOYSA-N Y InChI=1/2Al.3Se/q2*+3;3*-2 Key: CYRGZAAAWQRSMF-UHFFFAOYAJ
SMILES [Al+3].[Al+3].[Se-2].[Se-2].[Se-2]
Properties
Chemical formula	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)
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/mol
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
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. 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.