Vanadyl dibromide

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.s A hydrated vanadyl difluoride, V0F2.a, H20, is obtained as microscopic blue crystals when hypovanadic oxide, V02, is dissolved in excess of hydrofluoric acid and the solution concentrated slowly over sulphuric acid.1 The following double salts have been prepared, all of which are crystalline and fairly stable —5... 

Vanadium Oxymonobromide, VOBr, is prepared by the decomposition of vanadyl dibromide, VOBr2, in vacuo at 360° C. It forms violet, octahedral crystals, density 4-000 at 18° C. On being heated in vacuo at 480° C. it yields vanadium tribromide and vanadous oxide, V203. It is almost insoluble in water and the usual organic solvents.7... 

Vanadyl Dibromide, VOBr2, is obtained by passing bromine vapour or, preferably, a mixture of sulphur bromide, SaBra, and bromine over a mixture of vanadium pentoxide and sulphur at a red heat the product is heated in vacuo at 240° C., whereupon the vanadyl dibromide is obtained as a yellow powder.8 An alternative method of preparation consists in heating vanadium oxytribromide, VOBr3, to 180° C.9 Vanadyl dibromide is no doubt present in the blue solution which results when hypovanadic oxide, VOa, is dissolved in hydrobromic acid. 

Vanadyl dibromide is a hygroscopic, unstable compound. It dissolves in water to give a blue solution. On being heated in air it forms vanadium pentoxide in vacuo at 240° C. it partly sublimes and partly decomposes, with evolution of bromine and formation of a violet residue of vanadium oxymonobromide, VOBr. The dielectric constant has been investigated.1... 

No double salts of vanadyl dibromide have been prepared. 

Vanadium Oxytribromide, VOBr3, is produced when pure, dry bromine is passed over vanadous oxide, V2Os, heated to redness. Yellowish-white vapours are evolved which condense to a deep red, hygroscopic liquid, density 2-9673 at 0° C. It decomposes slowly at ordinary temperatures into vanadyl dibromide and bromine, but distils without decomposition at 130° to 136° C. under 100 mm. pressure. It is much less stable than vanadyl dibromide, VOBra.a... 

Moly bdenum diazide tetrachloride, 4164 Silver azide chloride, 0009 Tin azide trichloride, 4146 Titanimn azide trichloride, 4147 Titanimn diazide dibromide, 0273 Tungsten azide pentabromide, 0297 Tungsten azide pentachloride, 4182 Uranimn azide pentachloride, 4181 Vanadimn azide tetrachloride, 4166 Vanadyl azide dichloride, 4090 See AMMINEMETAL AZIDES... 

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