Characteristic

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

Chemical formula：As₂Se₃

CAS#:1303-36-2

Molar mass：386.72 g/mol

Appearance：brown-black powder

Odor：odorless

Density：4.75 g/cm³

Melting point：377 °C (711 °F; 650 K)

Solubility in water：insoluble

Crystal structure：Monoclinic, mP20

Application

Amorphous arsenic triselenide is used as a chalcogenide glass for infrared optics. When purified, it transmits light with wavelengths between ca. 0.7 and 19 µm.