Preparation, structure and properties of dinuclear Cu(II) Schiff base complexes with different type of bridging groups

Three dinuclear Cu(II) complexes with oxalate ([Cu-2(L1)(2)(ox)], 1), acetate ([Cu-2(AcO) (L2)(2)]BF4, 2) and phenolate group ([Cu-2(L-3)(2)] (ClO4)(2), 3) as bridging group, individually, were synthesised, and the crystal structures of composite complex [Cu-2(L1)(2)(ox)] . [Fe(OH)(2)(H2O)(4)]ClO4 . H2O(1') and complexes 2 and 3 were determined. X-ray crystal structure analyses comfirm that the crystals of 1', 2 and 3 exist in Fddd, P2(1)/c and P2(1)/c space group, respectively. The crystal cell parameters of 1' are: a=2.439 0(4) nm, b = 3.053 8(6) nm, c = 1.849 4(6) nm, alpha = beta = gamma = 90.00 degrees and these of 2 are: a = 0.847(1) nm, b = 2.654 2(8) nm, c = 1.410 0(6) nm, beta = 91.34(6)degrees; 3: a = 0.764 6(3) nm, b = 1.698 3(3) nm, c = 2.441 7(3) nm, beta = 97.11 degrees, Electrochemical investigations of 1 and 3 show that bicopper(II) centre experiences a mix-valence species during the course of reduction scan.