Arsenic triselenide

Arsenic triselenide
Arsenic triselenide[1]
CAS number 1303-36-2 YesY
PubChem 14772
ChemSpider 14089 YesY
RTECS number CG2285000
Jmol-3D images Image 1
Molecular formula As2Se3
Molar mass 386.72 g/mol
Appearance brown-black powder
Odor odorless
Density 4.75 g/cm3
Melting point

360 °C

Solubility in water insoluble
Crystal structure Monoclinic, mP20, SpaceGroup = P21/c, No. 14

mP20 P21/c 14

EU classification not listed
NFPA 704
NFPA 704.svg
Related compounds
Other anions diarsenic trioxide, diarsenic trisulfide, arsenic tribromide, arsenic(III) telluride
Other cations antimony(III) selenide
Related compounds arsenic(V) selenide
 YesY triselenide (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Arsenic triselenide (As2Se3) is an inorganic chemical compound, a selenide of arsenic.

Amorphous arsenic triselenide is used as a chalcogenide glass for infrared optics, as it transmits light with wavelengths between 870 nm and 17.2 µm.

Arsenic triselenide is covalently bonded. Even so, the arsenic has a formal oxidation state of +3.


Arsenic triselenide should be kept away from strong bases in contact with aluminium or zinc and strong acids.


  1. ^ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 4–43, ISBN 0-8493-0594-2 

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