Vanadium Tetrafluoride, VF₄

Vanadium Tetrafluoride, hypovanadic fluoride, VF₄, is produced by the action of anhydrous hydrogen fluoride on the corresponding chlorine compound, VCl₄, at temperatures from -28° to 0° C. It is an extremely deliquescent brown powder which readily undergoes hydrolysis with water, so that it does not give rise to double salts as in the case of the trifluoride. Its density at 23° C. is 2.9749. It decomposes above 325° C., yielding a mixture of the pentafluoride and the trifluoride:

2VF₄ = VF₅ + VF₃.