Abstract

PPh₄[VOBr⁴] was prepared by the reaction of PPh₄Br with VOBr₃ in CH₂Br₂ solu-tion. The structure of the dark violet crystals was determined with X-ray diffraction. PPh₄[VOBr₄] crystallizes in the space group P4/n with the lattice constants a = 1275.9 and c = 784.5 pm with two formula units per unit cell. The structure type corresponds to the frequently encountered AsPh₄[RuNCl₄] type. The VOBr₄^- ion forms a square pyramid; the V = O bond has a length of 155 pm. In the IR spectrum, the V -O stretching vibration appears at 922 cm^-1 .