Preparation of vanadium(V) oxide tribromide, vanadium(IV) oxide dibromide, and their reactions with ammonia
Abstract
Vanadium(V) oxide tribromide can be prepared in good yield by the reaction between vanadium(V) oxide trichloride and hydrogen bromide at 0°. Vanadium(IV) oxide dibromide is obtained by thermal decomposition of vanadium(V) oxide tribromide. Both these halides are soluble in liquid ammonia; VOBr2 gives the penta-ammoniate [VO(NH3)5]Br2, while VOBr3 undergoes ammonolysis and reduction.