Synthesis and Crystal Structure of Dinuclear Metal Complexes with Schiff Base Ligand of Bis-salicylaldehyde

Four dinuclear transition metal complexes with schiff base ligand of bis-salicylaldehyde have been synthesized and structurally characterized by means of elemental analysis,IR,UV,TGA and X-ray single-crystal diffraction.The results of structural analysis indicate that complex 1,3 and 4 belong to triclinic crystal system,space group P1 and the complex 2 belong to monoclinic crystal system,space group C2/c.In complex 1,two copper ions show different coordination environment,one of which has a five-coordinate,slightly distorted tetragonal pyramidal geometry and another has a four-coordinate squareplanar geometry.In complex 4,the binuclear units are held together to form an infinite 1D chain by bridging phenol O atoms.