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.

Production
Molybdenum(V) fluoride is produced by the reaction of molybdenum and molybdenum hexafluoride:
 * 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.

About 165 °C, it disproportionates to the tetra- and hexafluoride:
 * 2 MoF5 →  MoF4  +  MoF6