Synthesis , Characterization And Crystal Structure Of Transition Metal Complexes Of New Asymmetric Schiff Bases

The coordination compounds, synthesized with transition metal and Schiff-bases as raw materials, are more and more important for their various structures and extensive uses. The applied foreground of these compounds will be extensive in the field of catalysis, bioactivity and material etc. Among which, it is dramatically interesting that the complexes use as the polyethylene catalysis.In this paper, a new o-amino benzoic acid derivative, 2-amino-N-phenyl-benzamide, has been obtained. And twelve new asymmetric Schiff bases containing 2-amino-N-phenyl-benzamide have been synthesized and characterized as well as an isomeric compound of 2-(2-hydroxy-benzylideneamino)-N-phenyl-benzamide. Two of them, the isomeric compound of 2-(2-hydroxy-benzylideneamino)-N-phenyl-benzamide(HL1) and 2-(2-hydroxy-5-nitryl-benzyl-ideneamino)-N-phenyl-benzamide(HL2), are used to synthesize the complexes with transition metal ions(Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+), and fourteen complexes are achieved. [Cr(L1a)2].ClO4.2H2O1, Mn(Lla)22, [Fe(Lla)2].ClO4.H2O3, Co(Lla)24, Ni(Lla)25, Cu(Lla)26, Zn(Lla)27, [Cr(L2a)2].ClO4.2H2O8, Mn(L2)29, [Fe(L2)a].ClO4.2H2O 10, Co(L2)2 11, Ni(L2)212, [Cu(L2)2].H2O13, Zn(L2)214.These complexes are all determined by elemental analysis, infrared spectra, UV spectra and fluorescence spectra. The properties of these compounds are forecasted by experiment facts. The thermal decomposition of some complexes has been investigated by TG-DSC. Their thermal decomposition processes have been presumed by experiment factsThe crystal structures of one ligand and three complexes have been determined. They are HL1.C2H6OH, [Fe(Lla)2].ClO4.H2O 3, [Fe(L2)2].ClO4.2H2O 10 and [Cu(L2)2].H2O 13. In HL1.C2H6OH, compound 3 and 10, it has been found that all compounds were formedone-dimensional chain supramolecules combined by intermolecular hydrogen bonds. The ligand HL1 performs as a tridentate ligand in complex 3 as well as HL2does in complex 10. In complex 3 and 10, the central Fe(III) ions are in six coordination environment. However, one of the ligands is acted as a bidentate ligand in compound 13 because of the Jahn-Teller effect and the steric interference of the ligand. Therefore, the central Cu(II) ions are in five coordination environment.