Molybdenum hexafluoride

Molybdenum hexafluoride
Molybdenum hexafluoride
Identifiers
CAS number 7783-77-9 YesY
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
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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]

References

  1. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN 0080379419. 
  2. ^ US-Patent 5234679: Method of Refining Tungsten Hexafluoride Containing Molybdenum Hexafluoride as an Impurity, 10. August 1993.
  3. ^ US-Patent 6896866: Method for Purification of Tungsten Hexafluoride, 24. Mai 2005.

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