Synthesis and spectroscopic characterization of metal complexes with naphthofuran-2-carbohydrazide Schiff 's base

Abstract

Two Schiff-base ligands (I) naphthofuro-[phenylmethine]carbohydrazone [NPMC] and (II) naphthofruo-[3,4-dimethoxyphenylmethine]carbohydrazone [NDMeOPMC] were prepared by reaction between naphthofuran-2-carbohydrazone and benzaldehyde or 3,4-dihydroxybenzaldehyde, respectively. Both ligands are bidentate by coordinating through carboxy oxygen and azomethine nitrogen atoms. Complexes of the type MLX _n were obtained. where M = Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Hg(II), UO₂(II) and Th(IV), L = [NPMC] or [NDMeOPMC] and X = Cl₂ for Co(II), Cu(II), Ni(II), Zn(II), Cd(II) and Hg(II) complexes, X = NO₃, n = 2 for UO₂(II) complexes and X = NO₃, n = 4 for Th(IV) complexes. All the complexes and ligands were characterized IR, electronic, ¹H NMR, ESR, conductance data and magnetic susceptibility measurements.

Acknowledgements

One of the authors (MBH) is thankful to University Grants Commission (UGC), New Delhi for financial assistance in the form of a major research project and we are thankful to the Chairman, Department of Chemistry, Gulbarga University, Gulbarga for encouragement and providing the facilities. We also thank the Chairman, Department, Microbiology and Botany, Gulbarga University, Gulbarga for providing facilities to carry out biological activity.