Vanadium(III) bromide

Vanadium(III) bromide, also known as vanadium tribromide, is VBr3. In the solid-state, this species is a polymeric with octahedral vanadium(III) surrounded by six bromide ligands.

VBr3has been prepared by treatment of VCl4 with HBr:
 * 2 VCl4 + 8 HBr  →  2 VBr3  +  8 HCl  +  Br2

The reaction proceeds via the unstable vanadium(IV) bromide, VBr4, which releases Br2 at room temperature.

Like VCl3, VBr3 forms red-brown soluble complexes with dimethoxyethane and THF, such as mer-VBr3(THF)3.

Aqueous solutions prepared from VBr3 contain the salt  trans-[VBr2(H2O)4]+. Evaporation of these solutions give the salt trans-[VBr2(H2O)4]Br.