Synthesis, characterization and electrochemistry of copper(II), nickel(II), cobalt(II) and zinc(II) complexes of a binucleating ligand with [N 2S] 2O donors

Abstract

A heptadentate ligand (H 3L) with a phenoxo group bridging two metal centres has been synthesized by reacting 4-methyl-2,6-diformylphenol with methyl 2-((2-aminoethyl)amino)cyclopent-l-enedithiocarboxylate. Mono- and binuclear complexes of copper(II), nickel(II), cobalt(II) and zinc(II) have been synthesized and characterized by their UV—vis, IR, 1H and 13C NMR and EPR spectra. The electrochemistry of the complexes has been studied and the factors affecting electron-transfer reactions of the binuclear complexes vis-à-vis corresponding mononuclear complexes have been examined.