Arsenic(III) selenide

Arsenic triselenide

Names
Other names Arsenic(III) selenide
Identifiers
CAS Number	1303-36-2 Y
3D model (JSmol)	Interactive image
ChemSpider	14089 Y
ECHA InfoCard	100.013.745
PubChem CID	14772
RTECS number	CG2285000
UNII	XWS0W0GB8G
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
SMILES [Se]=[As][Se][As]=[Se]
Properties
Chemical formula	As2Se3
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)
Solubility in water	insoluble
Structure
Crystal structure	Monoclinic, mP20, SpaceGroup = P21/c, No. 14 mP20 P21/c 14
Hazards
EU classification (DSD) (outdated)	not listed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
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

mP20 P21/c 14

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.

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.

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