3. Research On The Synthesis, Structure And Properties Of Tetrazolium Metal Complexes

In this paper,we designed and synthesized three kinds of ligands which cotain N atoms:2-benzylsulfanyl-5-methyl-1,2,4-triazole[1,5-a]pyrimidine(L1),5-(4-nitrobenzyl)-1H-tetrazole(L2),5-(4-nitrophenyl)-1H-tetrazole(L3).Ligand 1 is the analogue of triazolopyrimidines and ligand 2 and 3 are the analogues of tetrazoles.Seven complexes have been synthesized by reactions of the three kinds of ligands and transition metals:[Cu2(L1)Cl2]n(1),[Cu(L1)2]n(2),[Cu(L1)2]n(3),[Zn(L2)2]n(4),[Cu2(L3)4(H2O)2]n(5),[Cu(L3)]n(6),[Cu(L3)CH3CN]n(7).All the complexes have been characterized by a number of analytical techeniques,such as X-ray crystallographic determination,IR,1H-NMR,XPS,PXRD,TGA,molar conductivity measurements,and so on.The fluorescence spectra and magnetic properties of these complexes were investigated and discussed.The concrete conlusions are listed as following:1.After the syntheses of ligand 1,2 and 3,the compositions and structures of ligand 1,2 and 3 were characterized by IR and 1H-NMR.And we synthesized threesingle crstals of ligand 1 and 3.X-ray crystallographic determination indicate that the structure of single crstal of ligand 1 is zero dimentional,and the structures of single crstals of ligand 3 are 1D chain and 2D layer by the connetion of H-bonds.2.Complexes 1-3 are belong to the analogues of triazoles,and are obtained by the reaction of ligand 1 and transition metal salt CuCl2 throught volatilization method.X-ray diffraction indicate that comlex 1 shows a 1D zigzag chain structure.And the structures of complexes 2 and 3 are both zero dementinal,but they form 2D planar structure and 1D chain structure by ?-? interaction.The study of magnetic properties indicates that the curves of complexes 1 and 3 conform to the Curie-Weiss.Luminesence analysis shows that complexes 1 and 2 emit bule light of the ligand 2,while complex 3 has no fluorescence properties.Complexes 2 and 3 are belong to structure consform.There exists great difference between Complexes 2 and 3.3.Complexes 4-7 are belong to the analogues of tetrazoles.Comlex 4 was obtained through the in-situ method,while complexes 5-7 were obtained through the direct method.X-ray diffraction indicate that comlex 5 shows a 1D chain structure,while Complexes 4 and 7 shows a 2D grid-net structure and Complex 6 shows 3D structure.