Aluminium(III) selenide

Aluminium selenide

Names
Other names Aluminium(III) selenide
Identifiers
CAS Number	1302-82-5 Y
3D model (JSmol)	Interactive image
ChemSpider	144477 Y
ECHA InfoCard	100.013.737
EC Number	215-110-6
PubChem CID	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
Hazards
EU classification (DSD) (outdated)	not listed
NFPA 704	0 3 3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

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):

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

Aluminium selenide should be stored and handled away from moisture and air.