| Arsenic triselenide[1] | |
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Other names
Arsenic(III) selenide |
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| Identifiers | |
| CAS number | 1303-36-2 |
| PubChem | 14772 |
| ChemSpider | 14089 |
| RTECS number | CG2285000 |
| Jmol-3D images | Image 1 |
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| 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
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| Related compounds | |
| Other anions | diarsenic trioxide, diarsenic trisulfide, arsenic tribromide, arsenic(III) telluride |
| Other cations | antimony(III) selenide |
| Related compounds | arsenic(V) selenide |
| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 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.
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.
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