Oxovanadium (IV) complexes of schiff bases obtained from salicylaldehyde derivatives and arylamines

Abstract Oxovanadium(IV) complexes of Schiff bases obtained from salicylaldehyde derivatives and arylamines (abbreviated as VO(X-SAL.R)2) have been synthesized, where X=H, 5,6-benzo, 5-Cl, and 5-Br, and R=Ph, CH3-Ph, 2,6-(CH3)2-Ph and 2,6-(C2H5)2-Ph, Ph being phenyl nucleus. Complexes of the type VO(5-X-SAL.Ph)2 in the solid state, X being Cl and Br, consist of the species having a different configuration from that of the other complexes. For the latter complexes, distortion from the square-pyramidal configuration is not apparent in the solid state or in non-donor solvents, but in pyridine they combine with one pyridine molecule to form six-coordinate vanadium(IV) complexes. Comparison shows that the tendency toward the distortion in the solid state is lower with R=aryl than with R=α-branched alkyl groups.