Investigation into aroylhydrazones as chelating agents. Part 8. Synthesis and spectroscopic characterization of complexes of Co, Ni, Cu, Zn, and Cd with 2,6-diacetylpyridine bis(salicyloylhydrazone); X-ray crystal structure of dichloro[2,6-diacetylpyridine bis(salicyloylhydrazone)]cadmium(II)–chloroform–methanol (1/1/1)

Abstract

Some new metal complexes of 2,6-diacetylpyridine bis(salicyloylhydrazone)(H₂daps) have been prepared from the reaction of the hydrazone with Co, Ni, Cu, Zn, and Cd chlorides and acetates. The chelating behaviour of the hydrazone has been spectroscopically investigated in all compounds by means of i.r. and ¹H n.m.r. techniques. The complex [Cd(H₂daps)Cl₂]·CHCl₃·CH₃OH has been subject to an X-ray analysis which established a seven-co-ordinate pentagonal-bipyramidal metal environment, with two axial Cl atoms and the H₂daps ligand forming the basal plane.