Hypovanadous Fluoride, VF₂

Hypovanadous Fluoride, vanadium difluoride, VF₂, has not been isolated, but a reddish-violet solution containing it is obtained by the action of excess of hydrofluoric acid on vanadium aluminium silicide, V₈Al₂Si₁₃, in the absence of air. In the presence of air the solution becomes green, with evolution of hydrogen:

2VF₂ + 2HF = 2VF₃ + H₂.

The solution behaves generally like one of vanadium dichloride.