| Selenium trioxide[1] | |
|---|---|
| Identifiers | |
| CAS number | 13768-86-0 |
| PubChem | 115128 |
| Properties | |
| Molecular formula | SeO3 |
| Molar mass | 126.96 g/mol |
| Appearance | white hygroscopic crystals |
| Density | 3.44 g/cm3 |
| Melting point |
118.35 °C |
| Boiling point |
sublimes |
| Solubility in water | very soluble |
| 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 references | |
Selenium trioxide (SeO3) 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.
References
- ^ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 4–81, ISBN 0849305942
- Greenwood, Norman N.; Earnshaw, A. (1997), Chemistry of the Elements (2nd ed.), 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:.
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