Synthesis, characterization and electrochemistry of a binuclear copper(II) complex of schiff base derived from 2-aminomethyl-benzimidazole and salicylaldehyde

Abstract

A dinuclear Cu^II compound (Cu₂L₂²⁺) with the phenoxide form of N-salicylidine 2-aminomethylbenzimidazole has been synthesized and characterized on the basis of elemental analysis, UV-visible, IR and variable temperature ESR spectra, magnetic moment and electrochemical studies. Thermal studies indicate that the decomposition takes place in two stages. Lowering of ESR peak intensity with lowering in temperature indicates the dimeric nature of the compound. A stopped flow kinetic study indicated that the acid catalysed decomposition of the compound occurred via two consecutive steps, thus providing further evidence for the dimeric nature of the compound. Evidence of equilibrium NH deprotonation of the benzimidazole moiety of Cu₂L₂²⁺ at 0.005 ≤ [OH^-], mol dm^-3 ≤ 0.02 is presented.