Crystal structure, electrochemical and magnetic properties of a new binuclear copper(II) complex with benzoic acid as a ligand

Abstract

A new complex [Cu₂(L)₄(DMF)₂] (1) with benzoic acid (HL) as a ligand is synthesized by the solid phase synthesis method. Crystal data for the complex are as follows: monoclinic, space group P2₁/n, a = 10.593(2) Å, b = 10.123(2) Å, c = 16.336(3) Å, β = 93.55(3)°, V = 1748.4(6) ų, D_c = 1.439 g/cm^–3, Z = 4, F(000) = 780, GOOF = 1.003, final discrepancy factors R₁ = 0.0624, wR₂ = 0.1559. In 1, the Cu(II) ion is coordinated by six oxygen atoms to give a distorted octahedral coordination geometry. The electrochemical, fluorescent, and magnetic properties of 1 are studied. The results show that the electron transfer of 1 is quasi reversible in the electrode reaction corresponding to Cu(II)/Cu(I), and 1 exhibits three relatively strong fluorescent emission peaks at 403, 425, and 454 nm. In addition, complex 1 displays antiferromagnetism in a temperature range of 300 ~ 10 K.