Preparations and properties of vanadium(III) complexes of bidentate and terdentate nitrogen-donor ligands

Abstract

Vanadium(III) chloride reacts with 1,10-phenanthroline and 2,2′-bipyridyl, and with substituted derivatives of each ligand (B), in ethanol or in acetonitrile as solvent (L), to yield two different series of complexes. These are (a) the neutral species VCl3BL, where B = 1,10-phenanthroline, 5-chloro-1,10-phenanthroline, 5-methyl-1,10-phenanthroline, 4,7-dimethyl-1,10-phenanthroline, 2,2′-bipyridyl, 4,4′-dimethyl-2,2′-bipyridyl, L = ethanol. The complexes in which B = 1,10-phenanthroline or 2,2′-bipyridyl were also obtained with L = acetonitrile, (b) [VCl2B2]+[VCl4B]− where B is the same series of ligands listed above. Vanadium(III) chloride yields VCl3 (terpy) with 2,2′,2 ″-terpyridyl. All the complexes have been characterised by elemental analyses, conductance measurements, electronic- and i.r. spectral measurements, and by their temperature-range (297–77 K) magnetic moments; ring substituents have little influence on any chemical or physical properties of these complexes.