Aluminium selenide
Other names	Aluminium(III) selenide
Identifiers
CAS number	1302-82-5
PubChem	164804
EC number	215-110-6
SMILES	[Al+3].[Al+3].[Se-2].[Se-2].[Se-2]
InChI InChI=1/2Al.3Se/q2*+3;3*-2
Properties
Molecular formula	Al2Se3
Molar mass	290.84 g/mol
Appearance	yellow to brown powder
Odor	odorless
Density	3.437 g/cm3
Melting point	947 °C, 1220 K, 1737 °F
Solubility in water	decomposes
Structure
Crystal structure	Monoclinic, mS20, Space group Cc, No. 9
Thermochemistry
Std enthalpy of formation ΔfHo298	-566.9 kJ/mol
Standard molar entropy So298	154.8 J/mol K
Hazards
EU classification	not listed
NFPA 704	0 3 3
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Aluminium selenide, also known as aluminum selenide or aluminium(III) selenide, is a chemical compound. Its chemical formula is Al₂Se₃. It contains aluminium in its +3 oxidation state. It contains aluminium and selenide ions.