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 | |