Molybdenum hexafluoride
From Wikipedia, the free encyclopedia
| Molybdenum hexafluoride | |
|---|---|
-fluoride.svg) |
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| Identifiers | |
| CAS number | 7783-77-9  |
| Properties | |
| Molecular formula | MoF6 |
| Molar mass | 209.93 g/mol |
| Appearance | white crystals or colorless liquid hygroscopic |
| Density | 2.54 g/cm3 |
| Melting point |
17.5 °C, 291 K, 64 °F |
| Boiling point |
34 °C, 307 K, 93 °F |
| Solubility in water | hydrolyzes |
| Structure | |
| Crystal structure | Orthorhombic, oP28 |
| Space group | Pnma, No. 62 |
| Coordination geometry |
octahedral (Oh) |
| Dipole moment | 0 |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Molybdenum hexafluoride is the highest fluoride of molybdenum. It is a solid which melts just below room temperature; in water, it hydrolyses to give hydrofluoric acid.[1]
It has few uses, and generally appears as an impurity in uranium hexafluoride (in the nuclear industry) or tungsten hexafluoride (in the semiconductor industry; WF6 is used for chemical vapour deposition of tungsten); it can be removed from the latter by reduction of a WF6-MoF6 mixture with any of a number of elements including molybdenum at moderately elevated temperature.[2][3]
[edit] References
- ^ Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.
- ^ US-Patent 5234679: Method of Refining Tungsten Hexafluoride Containing Molybdenum Hexafluoride as an Impurity, 10. August 1993.
- ^ US-Patent 6896866: Method for Purification of Tungsten Hexafluoride, 24. Mai 2005.
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