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

Three dinuclear Cu ( II ) complexes with oxalate ([Cu2(L1)2(ox)], 1), acetate ([Cu2(AcO)(L2)2]BF4, 2) and phenolate group ([Cu2(L3)2] (ClO4)2, 3)as bridging group, individually, were synthesised, and the crystal structures of composite complex [Cu2(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, P21/c and P21/c space group, respectively. The crystal cell parameters of l′ are: a = 2. 439 0(4) nm, 6 = 3.053 8(6) nm, c=1.849 4(6) nm,α= β=γ=90. 00° and these of 2 are: a; = 0. 847(1) nm, b=2. 654 2(8) nm, c=1. 410 0(6) nm, 0=91. 34(6)°; 3: a=0. 764 6(3) nm, b=1. 698 3(3) nm, c=2. 441 7(3) nm, β=97. 11°. Electrochemical investigations of 1 and 3 show that bicopper( K ) centre experiences a mix-valence species during the course of reduction scan.