Arsenic triselenide

Arsenic triselenide[1]
Other names Arsenic(III) selenide
Identifiers
CAS number	1303-36-2 Y
PubChem	14772
ChemSpider	14089 Y
RTECS number	CG2285000
Jmol-3D images	{{#if:[Se]=[As][Se][As]=[Se]|Image 1
SMILES [Se]=[As][Se][As]=[Se]
InChI InChI=1S/As2Se3/c3-1-5-2-4 Y Key: WBFMCDAQUDITAS-UHFFFAOYSA-N Y InChI=1/As2Se3/c3-1-5-2-4 Key: WBFMCDAQUDITAS-UHFFFAOYAQ
Properties
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
Structure
Crystal structure	Monoclinic, mP20, SpaceGroup = P21/c, No. 14 mP20 P21/c 14
Hazards
EU classification	not listed
NFPA 704	0 4 0
Related compounds
Other anions	diarsenic trioxide, diarsenic trisulfide, arsenic tribromide, arsenic(III) telluride
Other cations	antimony(III) selenide
Related compounds	arsenic(V) selenide
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 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.

Safety

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

References