Investigation into aroylhydrazones as chelating agents. Part 7. Synthesis and spectroscopic characterization of complexes of MnII, CoII, NiII, CuII, and ZnII 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 Mn^II, Co^II, Ni^II, Cu^II, and Zn^II 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.