Synthesis And Properties Of Metal-organic Coordination Polymers Containing Nitroazole Ligands

In recent years,metal-organic coordination polymers（MOCPs）have aroused extensive attention due to their wide range of application prospects in the fields of optics,electricity,and catalysis.Researchers have been committed to regulating the structure of the complex by appropriate means to obtain a metal-organic coordination polymer material with novel structures and specific properties.In this thesis,three different nitrogen-containing ligands were selected,and five functionalized MOCPs materials with new structures were prepared by hydrothermal or solvothermal method.The structures and properties of the above MOCPs materials were studied.1.With the mixed-ligand strategy that 1,2,4-triazole（trz）was adopted as the main ligands and 4,5-bis（diphenyl phosphine）-9,9-dimethyl oxide（xantphos）as the auxiliary ligand,two MOCPs materials featuring one-dimensional structure were successfully prepared by modulating the proportion of the reactants in a mixed solution of N,N-dimethylformamide（DMF）and water,which are complex 1 and complex 2,respectively.The two complexes are both linear structure but with varies orientations:complex 1stretches into a zigzag shape and complex 2 helical twist.We characterized the luminescent properties of above complexes,and found that complex 1 and complex 2 are excellent phosphorescent materials,in which the complex 1 exhibits blue luminescence,while the complex 2 green.2.Being selected as an organic ligand,3-（pyrid-3-yl）-5-（1H-1,2,4-triazol-3-yl）-1,2,4-triazolyl（pttrz）was coordinated with the transition metal Co²⁺,and a Keggin polyoxometalate was successfully introduced into the complex 3 by hydrothermal method.Explored its magnetic properties,we found that it has an anti-ferromagnetic property and is a potential anti-magnetic interference material.3.In a mixed solution of DMF and water,organic ligand 4,5-imidazole dicarboxylic acid（H₃IDC）was formed into two kinds of three-dimensional network structure with rare earth ion Tb³⁺,Ho³⁺.The MOCPs material are complex 4 and complex 5,respectively.Both of the complexes are crystallized the same,as non-cardinal group Fdd2,except for the different center metal ions.The results from the non-linear optical experiment reveal that complex 4 has a significant second harmonic generation（SHG）effect.Taking into account its obvious green emission,these results indicates its promising application as a multi-functional optical material having green luminescence and secondary nonlinear optical properties.