Complexes of vanadium(III) chloride and bromide with pyridine, 2,2′-bipyridyl, and 1,10-phenanthroline

Abstract

The reactions of pyridine, 2,2′-bipyridyl, and 1,10-phenanthroline with vanadium(III) chloride and bromide (and their amine and methyl cyanide complexes) have been studied. Pyridine gave VX₃,3py complexes, but the stoicheiometry of the products from reactions involving the bidentate ligands depended on experimental conditions. Thus with excess of bipyridyl or phenanthroline, complexes VX₃,2B were obtained and characterised as ionic species [VX₂B₂]X. An ionic structure [VX₂B₂][VX₄B] has been assigned to the 2VCl₃,3bipy complex. Several non-ionic complexes (e.g., VCl₃,bipy,CH₃CN) were also prepared. Spectroscopy indicates that the vanadium has a hexaco-ordinate environment in all the complexes.