Selenium trioxide
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2008-05-29T14:29:09Z
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{{expert-subject|Chemistry|date=January 2007}}
{{Chembox new
| Name = Selenium trioxide
| OtherNames =
| Section1 = {{Chembox Identifiers
| CASNo = 13768-86-0
}}
| Section2 = {{Chembox Properties
| Formula = SeO<sub>3</sub>
| MolarMass = 126.96 g/mol
| Appearance = white crystals<br /> [[hygroscopic]]
| Density = 3.6 g/cm<sup>3</sup>, solid
| Solubility = Very soluble, reacts
| MeltingPt = 117.85 - 118.85°C
| BoilingPt = 180°C (decomposes)
}}
| Section3 = {{Chembox Structure
| CrystalStruct = tetragonal
}}
| Section7 = {{Chembox Hazards
| EUClass = not listed
}}
}}
'''Selenium trioxide''' ([[Selenium|Se]][[Oxygen|O<sub>3</sub>]]) is a [[chemical compound]] used in the manufacture of photoelectric cells and solar energy devices.
A laboratory preparation is to react anhydrous K<sub>2</sub>SeO<sub>4</sub> and SO<sub>3</sub>. The compound is thermodynamically unstable with respect to [[selenium dioxide]]. The solid consists of cyclic tetramers, Se<sub>4</sub>O<sub>12</sub>. In the gas phase there is some dissociation into the monomer
==Bibliograpy==
*{{Greenwood&Earnshaw}}
*{{cite journal | last = Schmidt | first = Prof. Dr. Max | coauthors = Dr. P. Bornmann, Dr. Irmgard Wilhelm
| date = 1963-10-2 | title = The Chemistry of Selenium Trioxide | journal = Angewandte Chemie International Edition in English | volume = 2 | issue = 11 | pages = 691–692 | doi = 10.1002/anie.196306913 }}
==References==
{{Unreferenced|date =September 2007}}
{{reflist}}
[[Category:Oxides]]
[[Category:Selenium compounds]]
[[Category:Inorganic compound stubs]]
{{inorganic-compound-stub}}
[[ar:ثلاثي أكسيد سيلينيوم]]
[[it:Triossido di selenio]]
[[ja:三酸化セレン]]