Molybdenum(V) fluoride

Molybdenum(V) fluoride is an inorganic compound with the formula MoF5. It is a hygroscopic yellow solid. Like most pentafluorides, it exists as a tetramer.[2]

Molybdenum(V) fluoride
Molybdenum(V) fluoride
Names
IUPAC names
Molybdenum(V) fluoride
Molybdenum pentafluoride
Identifiers
3D model (JSmol)
  • InChI=1S/5FH.Mo/h5*1H;/q;;;;;+5/p-5
    Key: NBJFDNVXVFBQDX-UHFFFAOYSA-I
  • F[Mo](F)(F)(F)F
Properties
F5Mo
Molar mass 190.94 g·mol−1
Appearance yellow solid
Density 3.44 g/cm3
Melting point 45.7 °C (114.3 °F; 318.8 K)[1]
Boiling point 50 °C (122 °F; 323 K)[1] (sublimes)
Thermochemistry
96.6 J/mol·K
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 oxidizer, hydrolyzes to release HF
Flash point Non-flammable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Production

Molybdenum(V) fluoride is produced by the reaction of molybdenum and molybdenum hexafluoride:[3]

Mo + 5 MoF6 → 6 MoF5

It can also be prepared by the reduction of molybdenum hexafluoride with phosphorus trifluoride or tungsten hexacarbonyl, or by the oxidation of elemental molybdenum with fluorine at 900 °C.[3]

About 165 °C, it disproportionates to the tetra- and hexafluoride:[1]

2 MoF5 → MoF4 + MoF6

References
  1. Stene, Riane E.; Scheibe, Benjamin; Pietzonka, Clemens; Karttunen, Antti J.; Petry, Winfried; Kraus, Florian (2018). "MoF5 revisited. A comprehensive study of MoF5". Journal of Fluorine Chemistry. 211: 171–179. doi:10.1016/j.jfluchem.2018.05.002. ISSN 0022-1139. S2CID 103463040.
  2. Edwards, A. J. (1969). "Crystal Structure of tungsten pentafluoride". J. Chem. Soc. A: 909. doi:10.1039/J19690000909.
  3. T. J. Ouellette, C. T. Ratcliffe, D. W. A. Sharp, A. M. Steven (1972). "Molybdenum(V) Fluoride (Molybdenum Pentafluoride)". Molybdenum(V) Fluoride (Molybdenum pentalfluoride). Inorganic Syntheses. Vol. 13. pp. 146–150. doi:10.1002/9780470132449.ch28. ISBN 9780470132449.{{cite book}}: CS1 maint: multiple names: authors list (link)


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