Syntheses,Crystal Structures And Characterization Of The Complexes With 2-Substituted-5-Pyridyl-1,3,4-oxadiazole

1,3,4-Oxadiazole,imidazole and their derivatives have been widely used in pharmaceuticals,agricultural chemicals and industry fields.In order to study of new complexes of 1,3,4-oxadiazole and imidazole,we have synthesized some 1,3,4-oxadiazole and imidazole compounds and transition-metal complexes.The single crystal structures of complexes were also determined.This thesis is composed of following sections:1.Six oxadiazole compounds and two imidazole compounds have been synthesized.The single crystal structure of 2-methyl-5-(2-pyridyl)-1,3,4-oxadiazole was determined by X-ray analysis.2.Four transition-metal complexes of[Cu2L2(μ-Cl)2Cl2],[Ag2(μ-L)2(μ-NO3)2]n,[CdL2(NO3)2]and[CoL2(H2O)2](ClO4)2-2H2O were prepared from the ligand of 2-methyl-5-(2-pyridyl)-1,3,4-oxadiazoles(L).The complex of[Cu2L2(μ-Cl)2Cl2]is a binuclear copper(II)complex bridged by two chloride atoms.The complex of[Ag2(μ-L)2(μ-NO3)2]n is a silver(I)polymer complex bridged by two nitrogen atoms in the 1,3,4-oxadiazole ring and two oxygen atoms in nitrate ion.3.Four complexes of[ZnL’Cl2],[AgL’2](N03),[NiL’2(OAc)](ClO4)-2H2O and[NiL’2(NO3)]NO3 were prepared from the ligand of 4,5-dimethyl-2-(6-methyl-2-pyridyl)-imidazole(L’).The central Zn(II)atoms of[ZnL’Cl2]possess distorted tetrahedral geometries with ZnN2Cl2,and the central Ag(I)atoms of[AgL’2](NO3)have distorted tetrahedral geometries with AgN4.4.The complexes have been characterized by IR,UV/Vis,fluorescence properties and TGA.