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 m.

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

Safety

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

References

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