Synthesis, Characterization, and Electrochemical Studies of Ternary Complexes of Lanthanum (III) and Cerium (III) with Some Naphthylideneamino Acids and Imidazoles

A new series of ternary lanthanium(III) and cerium(III) complexes containing Schiff bases derived from some amino acids, viz: glycine; alanine; phenylalanine; valine and leucine with 2-hydroxy-1-naphthaldehyde as primary ligands, and 1-methylimidazole & 1,2-dimethylimidazole as secondary ligands were synthesized. The complexes were characterized on the bases of microanalyses, electrical conductance, IR & ¹H NMR spectra, thermal analysis and cyclic voltammetric data. All complexes were found to be non-electrolytes with the general formula of [ML(NO₃)Im · nH₂O] (where M=La(III) or Ce(III), L=naphthylideneamino acids, Im=1-methylimidazole or 1,2-dimethylimidazole and n=1 or 2). The redox properties of some of the ternary complexes of La(III) and Ce(III) were examined using cyclic voltammetry in 0.1 mol dm⁻³ TBAP/DMSO solutions. The reduction potentials of the investigated complexes showed a …