Vanadyl Difluoride, VOF2, is prepared by the action of anhydrous hydrogen fluoride on vanadyl dibromide, VOBr2. It is a yellow substance. Density at 19° C., 3.3956. A hydrated vanadyl difluoride, VOF2.xH2O, is obtained as microscopic blue crystals when hypovanadic oxide, VO2, is dissolved in excess of hydrofluoric acid and the solution concentrated slowly over sulphuric acid. The following double salts have been prepared, all of which are crystalline and fairly stable:
VOF2.2NH4F VOF2.2NH4F.H2O VOF2.3NH4F 4VOF2.7NH4F.5H2O | 3VOF2.8NaF.2H2O VOF2.2KF 3VOF2.7KF VOF2.2TlF | VOF2.CoF2.7H2O VOF2.NiF2.7H2O VOF2.ZnF2.7H2O VOF2.CdF2.7H2O | |