Investigation into aroylhydrazones as chelating agents. Part 7. Synthesis and spectroscopic characterization of complexes of Mn II , Co II , Ni II , Cu II , and Zn II with 2,6-diacetylpyridine bis(2-aminobenzoylhydrazone) and X-ray structure of chloro[2,6-diacetylpyridine bis(2-aminobenzoylhydrazone)](methanol)manganese(II) chloride monohydrate

Abstract

A series of MnII, CoII, NiII, CuII, and ZnII complexes with 2,6-diacetylpyridine bis(2-aminobenzoylhydrazone)(H2dapab) has been prepared from the reaction of the hydrazone with metal chlorides and acetates. The i.r. spectra are reported and evaluated to obtain information on the co-ordinating behaviour of the hydrazone. An X-ray diffraction analysis carried out on [Mn(H2dapab)(CH3OH)Cl]Cl·H2O has shown it to possess pentagonal-bipyramidal geometry with the H2dapab ligand occupying the equatorial plane and the Cl and CH3OH groups at the axial sites. The structure has been refined to R= 0.0676 for 2173 observed diffractometer data.