Tungsten pentafluoride explained

Tungsten(V) fluoride is an inorganic compound with the formula WF₅. It is a hygroscopic yellow solid. Like most pentafluorides, it adopts a tetrameric structure, consisting of [WF₅]₄ molecules. In this way, each W center achieves octahedral coordination.^[1]

Production

Tungsten(V) fluoride is produced by the reaction of tungsten and tungsten hexafluoride:^[2]

W + 5 WF₆ → 6 WF₅

At room temperature, it disproportionates to the tetra- and hexafluoride:

2 WF₅ → WF₄ + WF₆

References

1. 10.1039/J19690000909. Crystal Structure of tungsten pentafluoride. J. Chem. Soc. A. 909. 1969. Edwards. A. J..
2. Schröder, Johann; Grewe, Franz J.. Darstellung und Eigenschaften von Wolframpentafluorid. Chemische Berichte . 103. 1970. 5. 1536–46. 10.1002/cber.19701030524.