Synthesis, crystal structure, electrochemical property, and antioxidant activity of copper(II) complex based on 4-butyloxy-2,6-bis(1-methyl-2-benzimidazolyl)pyridine

A new copper(II) complex [Cu(bmbp)Cl2]·DMF, where bmbp is 4-butyloxy-2,6-bis(1-methyl-2-benzimidazolyl)pyridine, was synthesized and characterized by X-ray single-crystal structure analysis. The complex crystallizes in triclinic, space group P-1 with a = 8.4551(3) A, b = 12.8262(4) A, c = 14.7111(5) A, α = 64.335(3)°, β = 75.314(3)°, γ = 86.749(2)°, V = 1388.42(8) A3, Z = 2. The Cu(II) ion adopts a distorted trigonal bipyramidal geometry coordinated by three nitrogen atoms of the ligand and two chloride atoms. TG analysis showed that the complex has high thermal stability. Electrochemical measuring exhibited an irreversible one-electron transfer process. DPPH radical scavenging assay showed that the ligand and its Cu(II) complex exhibited much lower antioxidant activity than that of ascorbic acid.