| Abstract: In this thesis four novel NO ligands with pyrazol-l-yl or triazol-l-yl groups were designed and synthesized. A series of complexes derived from these ligands and transition-metal cations (Zn(Ⅱ), Cu(Ⅱ), Ni (Ⅱ), Co(Ⅱ) and Fe (Ⅲ)) were prepared and characterized by the Elemental Analysis, 1H NMR spectra, Infrared spectra and TG-DSC analyses. Additionally, single crystals of two compounds, suitable for X-ray diffraction analysis, were grown and their structures were determined. The unit-cell parameters were listed below: ligand 2-((N-benzotriazol-1-yl) methylamino)benzoic acid (HL4) is monoclinc with space group P2(1)/c and unit-cell parameters of a=10.225A, b=15.669A, c=8.098A; compound [Cu2(mppm)4(CH3O)2](NO3)2 (21) is triclinic with space group P-1 and unit-cell parameters of a=11.017(6)A, b=15.143(9)A, c=14.906(8)A. Interestingly, when the ligand (5-methyl-3-phenyl-pyraz- ol-1-yl)methanol was employed to interact with Cu(NO3)2·6H2O in the presence of sodium hydroxide, a new compound [Cu2(mppm)4(CH3O)2](NO3)2 (mppm=5-methyl-3-phenyl -pyrazol-1-yl)methanol) 21 was obtained due to the cleavage of the C-N bond between the pyrazole group and the methanol main frame as well as the coordination transfer of the cleavage product. Meanwhile, the thermoanalyses of some selected complexes were performed and interesting results were obtained.At the third part of the thesis, a farther study was carried out on the four new N20 ligands which were synthesized in our laboratory. A number of their transition-metal (Zn(Ⅱ), Cu(Ⅱ), Ni(Ⅱ) and Co(Ⅱ)) complexes were synthesized. These compounds were also undergone the Elemental analysis, FT-IR and TG-DSC analysis. The crystal structures of one ligand and two complexes were determined by X-ray diffraction analysis. The unit-cell parameters were listed below: ligand HL9 is orthorhombic with space group Pbca and unit-cell parameters of a=9.8322A, b=12.109(2)A, c=17.141(3)A; compound Co2(L5)2(NO3)2 4 is monoclinc with space group P2(1)/c and unit-cell parameters of a=11.028(4)A, b=16.885(6)A, c=11.514(4)A; compound [Zn2(L8)2(NO3)2]·H2O 13 is triclinic with space group P-1 and unit-cell parameters of a=8.663(9)A, b=10.766(11)A, c=10.774(11)A. Both compounds 4 and 13 are binuclear complexes. The compound 13 has an inversion center, but in compound 4 the two nitrate anions bind each to one cobalt (Ⅱ) center in a bidentate fashion with cis arrangement. Finally, the catecholase activity of some dicopper (Ⅱ) complexes were studied, of them [Cu2(mppm)4(CH3O)2](NO3)2, [Cu2(L8)2(NO3)2]·2CH3OH and [Cu2(L9)2(NO3)2]·2CH3OH have been chosen to investigate their potential as catalysts for the aerial oxidation of 3, 5-di-tert-butylcatechol (3, 5-DTBC) to 3, 5-di-tert-butylquinone (3, 5-DTBQ). The results indicated that both dicopper (Ⅱ) complexes are active in the oxidation of model catechol..
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