Arsenic triselenide
Names
Other names
Arsenic(III) selenide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.745 Edit this at Wikidata
EC Number
  • 215-119-5
RTECS number
  • CG2285000
UNII
  • InChI=1S/As2Se3/c3-1-5-2-4 checkY
    Key: WBFMCDAQUDITAS-UHFFFAOYSA-N checkY
  • InChI=1/As2Se3/c3-1-5-2-4
    Key: WBFMCDAQUDITAS-UHFFFAOYAQ
  • [Se]=[As][Se][As]=[Se]
Properties
As2Se3
Molar mass 386.756 g·mol−1
Appearance brown-black powder[1] or metallic gray crystals
Odor odorless
Density 4.75 g/cm3[1]
Melting point 377 °C (711 °F; 650 K)[1]
insoluble[1]
Structure[2]
Monoclinic, mP20
P21/c, No. 14
a = 0.43 nm, b = 0.994 nm, c = 1.29058 nm
α = 90°, β = 109.927°, γ = 90°
4
Hazards
GHS labelling:
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
H301, H330, H331, H373, H410
P260, P261, P264, P270, P271, P273, P284, P301+P310, P304+P340, P310, P311, P314, P320, P321, P330, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
4
0
0
Related compounds
Other anions
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).
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Arsenic triselenide is an inorganic chemical compound with the chemical formula As2Se3.

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.[3]

In arsenic triselenide, arsenic is covalently bonded to selenium, where arsenic has a formal oxidation state of +3, and selenium −2.

Solution processed thin film As2Se3

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.[4]

References

  1. ^ a b c d Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. p. 4.49. ISBN 9781498754293.
  2. ^ Renninger, A. L.; Averbach, B. L. (1973). "Crystalline structures of As2Se3 and As4Se4". Acta Crystallographica Section B. 29 (8): 1583–1589. doi:10.1107/S0567740873005091.
  3. ^ Guillevic, Erwan; Zhang, Xianghua; Adam, Jean-Luc; Ma, Hongli; Lucas, Jacques; Tariel, Hugues (2011). "Fabrication of highly homogeneous As2Se3 glass under argon flow". Journal of Non-Crystalline Solids. 357 (15): 2897–2902. Bibcode:2011JNCS..357.2897G. doi:10.1016/j.jnoncrysol.2011.03.030.
  4. ^ Zou, Yi; Lin, Hongtao; Ogbuu, Okechukwu; Li, Lan; Danto, Sylvain; Novak, Spencer; Novak, Jacklyn; Musgraves, J. David; Richardson, Kathleen; Hu, Juejun (2012). "Effect of annealing conditions on the physio-chemical properties of spin-coated As2Se3 chalcogenide glass films". Optical Materials Express. 2 (12): 1723. Bibcode:2012OMExp...2.1723Z. doi:10.1364/OME.2.001723. S2CID 32070511.


source: http://en.wikipedia.org/wiki/Arsenic_triselenide