Synthesis, spectroscopic characterization and properties of new metal complexes

A new series of the polydentate Schiff base Cu-II, Co-II, Ni-II, Pd-II and Zn-II complexes derived from ethylenediamine (eda), diethylenetriamine (dea) and tris(2-aminoethyl)amine (taa) have been prepared by template condensation in MeOH solution, and characterized by i.r., electronic spectral data, elemental analyses, conductivity and magnetic measurements. The H-1- and C-13-n.m.r. and mass spectral data of the Ni-II, Pd-II and Zn-II complexes have been recorded. In all complexes, some of the chloride ions coordinate to the metal ions. From conductivity measurements, it is shown that the complexes are electrolytes. The Ni-II, Pd-II and Zn-II complexes have diamagnetic character. In this study, the Schiff base Cu-II and Co-II complexes have sub-normal magnetic moments commensurate with their binuclear or tetranuclear nature. Some show antimicrobial activity against bacteria and yeast.