Arsenic triselenide

Arsenic triselenide (As2Se3) is an inorganic chemical compound, a selenide of arsenic.

Arsenic triselenide
Names
Other names
Arsenic(III) selenide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.745
EC Number
  • 215-119-5
RTECS number
  • CG2285000
UNII
Properties
As2Se3
Molar mass 386.72 g/mol[1]
Appearance brown-black powder[1]
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 pictograms
GHS Signal word Danger
GHS hazard statements
 H301, H330, H331, H373, H400, H410
P260, P261, P264, P270, P271, P273, P284, P301+310, P304+340, P310, P311, P314, P320, P321, P330, P391, P403+233, P405, P501
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 4: Very short exposure could cause death or major residual injury. E.g. VX gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
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).
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Infobox references

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]

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

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]

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References
  1. 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.


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