Selenium trioxide

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Selenium trioxide
Identifiers
CAS number	[13768-86-0]
Properties
Molecular formula	SeO₃
Molar mass	126.96 g/mol
Appearance	white crystals hygroscopic
Density	3.6 g/cm³, solid
Melting point	117.85 - 118.85°C
Boiling point	180°C (decomposes)
Solubility in water	Very soluble, reacts
Structure
Crystal structure	tetragonal
Hazards
EU classification	not listed
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Selenium trioxide (Se O₃) is a chemical compound used in the manufacture of photoelectric cells and solar energy devices. A laboratory preparation is to react anhydrous K₂SeO₄ and SO₃. The compound is thermodynamically unstable with respect to selenium dioxide. The solid consists of cyclic tetramers, Se₄O₁₂. In the gas phase there is some dissociation into the monomer

[edit] Bibliograpy

Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
Schmidt, Prof. Dr. Max; Dr. P. Bornmann, Dr. Irmgard Wilhelm (1963-10-2). "The Chemistry of Selenium Trioxide". Angewandte Chemie International Edition in English 2 (11): 691–692. doi:10.1002/anie.196306913.

[edit] References

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