Synthesis, physical and electrochemical characterization of mono- and heterobinuclear m -functionalized iron(III) Schiff base complexes

Abstract

Mo(NO)T p * Cl2 (T p * = 3,5-dimethyl pyrazole) when reacted with m-functionalized Fe(III) Schiff base complexes; the Schiff base ligands being derived from condensation of 2,4-dihydroxybenzaldehyde or salicylaldehyde with a variety of α,ω-diamines [1,2-C6H4(NH2)2, NH2(CH2) n NH2; n = 2–4] affords bimetallic complexes containing two potential reduction centers. The compounds were characterized by physicochemical and spectroscopic methods. It is shown that as the polymethylene carbon chain of the Schiff base backbone increases, the physicochemical and spectroscopic properties also change gradually. Electrochemical data show that the m-functionalized complexes reduce at potentials less cathodic than their p-substituted analogues. It is also shown that the redox potentials are solvent dependent.