Arsenic triselenide

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Arsenic triselenide[1]
Other names
Arsenic(III) selenide
3D model (JSmol)
ECHA InfoCard 100.013.745
RTECS number CG2285000
Molar mass 386.72 g/mol
Appearance brown-black powder
Odor odorless
Density 4.75 g/cm3
Melting point 360 °C (680 °F; 633 K)
Monoclinic, mP20, SpaceGroup = P21/c, No. 14

mP20 P21/c 14

not listed
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 4: Very short exposure could cause death or major residual injury. E.g., VX gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Other anions
diarsenic trioxide, diarsenic trisulfide, arsenic tribromide, arsenic(III) telluride
Other cations
antimony(III) selenide
Related compounds
arsenic(V) selenide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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 [reference needed].

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

Solution processed thin film As2Se3[edit]

Thin film selenide glasses have emerged as an important material for integrated photonics due to its high refractive index, mid-IR transparency and high non-linear optical indices. High-quality As2Se3 glass films can be deposited from spin coating method from ethylenediamine solutions.[2]


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 
  2. ^ Yi Zou, Hongtao Lin, Okechukwu Ogbuu, Lan Li, Sylvain Danto, Spencer Novak, Jacklyn Novak, J. David Musgraves, Kathleen Richardson, and Juejun Hu, “Effect of annealing conditions on the physio-chemical properties of spin-coated As2Se3 chalcogenide glass films,” Optical Materials Express, Vol. 2, Issue 12, pp. 1723-1732 (2012).