The Syntheses, Characterization, Structure And Property Studies Of Schiff Base Metal Complexes Constructed Through Derivatives Of Salicylaldehydes

This paper prepared N,N-Dis(o-oxy-acetale)benzylethylenediamine ligand (L) byo-Formylphenoxyacetic acid and ethylene diamine. The complexes Zn(II)L·H₂O(1)Co(II)L·H₂O (2) were synthesized by the ligand(L) and the Zinc(II) dichloride,Cobalt(II)dichloride respectively in water solvent, while the complexCu(II)ClL₁·2H₂O(3)(L1= N-(o-oxy-acetale)benzylethylenediamine), not Cu(II)L·H₂O, wasobtained after the reaction of ligand(L) and Copper(II) dichloride in water solvent, andZn(II)L·CH3OH (4) was prepared by o-Formylphenoxyacetic acid, ethylene diamine andzinc(II) dichloride through one-step procedure in methanol. The ligand and their metal complexes were characterized by elemental analysis, H 1NMR and FT-IR spectroscopy, the structures of the complexes were determined by singlecrystal X-ray diffraction analysis. The results of the single crystal X-ray diffraction analysisare that the structures of the complexes Zn(II)L·H₂O(1), Zn(II)L·CH₃OH (4) andCo(II)L·H₂O (2) are similar, they are six-coordinated with single molecular of hexadentateSchiffbase ligands ,and the metal ions(Zn(II), Co(II)) exhibit a distorted trigonal prismaticcolumn geometry. In the crystal geometry of complex Cu(II)ClL₁·2H₂O(3), the complex isfive-coordinated, and the environment aroud copper(II) ion is square pyramid geometry.Because of the weak coordination between the copper(II) ion and the OW2 molecule, thestructure tends to quasi-octahedron geometry with six-coordinated. There are two independent molecules of Zn(II)L (or Co(II)L ) and two water moleculesin one asymmetric unit of complex 1(or 2), the crystal structure of Cu(II)ClL₁·2H₂O consistsof one molecule of Cu(II)ClL₁ and two water solvate molecules in the asymmetric unit,while the Zn(II)L·CH3OH (4) comprises of one molecule of Zn(II)L and a methanolmolecule in per unit. In the packings of complexes 1 and 2, the C-H···π and C-H···O interactions stabilize the twocomplexes in a 2D sheet like configuration, while only C-H···O interactions existed in complex 4to form the same configuration. The packing of complex 3 are connected with the varioushydrogen bonds among the molecules, especially the molecules OW1,OW2 and Cu(II)ClL₁. We cooperated with the others in studying the biology activity of the complexesCo(II)L·H₂O and Cu(II)ClL₁·2H₂O simply.