Synthesis, characterization, crystal structure, and electrochemical property of copper(II) complexes with Schiff bases derived from 5-halogenated salicylaldehyde and amantadine

A mixture of copper(II) chloride dihydrate and ligands derived from amantadine and 5-halogenated salicylaldehyde in anhydrous methanol generated two novel complexes C34H38Cl2CuN2O2 (I) and C34H38Br2CuN2O2 (II), respectively. The complexes were characterized by melting point, elemental analysis, molar conductance, IR, UV-Vis, and single-crystal X-ray diffraction (CIF files nos. 1435429 (I), 1435430 (II)). Single-crystal X-ray diffraction analysis reveals that both complexes crystallize in monoclinic system, P2(1)/c space group. Each asymmetric unit consists of two mononuclear copper(II) complex molecules and each complex molecule includes one copper(II) atom two corresponding deprotonated ligands. The central copper(II) atom is four-coordinated via two nitrogen atoms and two oxygen atoms from the corresponding Schiff base ligands, forming a distorted tetrahedral geometry. Electrochemical properties of the complexes were studied by cyclic voltammetry.