Vanadium(IV) fluoride (VF<sub>4</sub>) is an inorganic compound of vanadium and fluorine. It is paramagnetic yellow-brown solid that is very hygroscopic. Unlike the corresponding vanadium tetrachloride, the tetrafluoride is not volatile because it adopts a polymeric structure. It decomposes before melting.
VF<sub>4</sub> can be prepared by treating VCl<sub>4</sub> with HF:
It was first prepared in this way.
It decomposes at 325 ðC, undergoing disproportionation to the tri- and pentafluorides:
The structure of VF<sub>4</sub> is related to that of SnF<sub>4</sub>. Each vanadium centre is octahedral, surrounded by six fluoride ligands. Four of the fluoride centers bridge to adjacent vanadium centres.