CRYSTAL STRUCTURE, ELECTROCHEMICAL AND MAGNETIC PROPERTIES OF A NEW BINUCLEAR COPPER(II) COMPLEX WITH BENZOIC ACID AS A LIGAND

A new complex [Cu-2(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 P2(1)/n, a = 10.593(2) angstrom, b = 10.123(2) angstrom, c = 16.336(3) angstrom, beta = 93.55(3)degrees, V = 1748.4(6) angstrom(3), D-c = 1.439 g/cm(-3), Z = 4, F(000) = 780, GOOF = 1.003, final discrepancy factors R-1 = 0.0624, wR(2) = 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 similar to 10 K.