Synthesis,Structure And Luminescence Properties Of Coordination Polymers Based On Transition Metal

Metal organic frameworks(MOFs)are a kind of porous crystalline materials,the main building unit including metal ions or metal clusters and organic ligands with bonding sites,usually has a large specific surface area,permanent porosity and virable structure.In the past decades,MOFs materials have developed rapidly,widely used in gas adsorption and separation,catalysis,sensing,magnetic materials,drug release and so on.Among them,the development of luminescent MOFs is relatively backward.But as research continues and technology improves,reports of light-emitting MOFs are increasing.Generally,the strategies for constructing luminescent MOFs are as follows:(1)selecting organic ligands with luminescent properties;(2)select metal ions with luminous properties;(3)introduce luminous guest molecules.The choice of polydentate carboxylic acid ligands and transition metal ions with d¹⁰ configuration can usually lead to metal organic frameworks with excellent luminescence performance.Meanwhile,the unique ligand structure is also conducive to obtaining the framework with novel structure.Based on this,this paper mainly did the following two parts:1.Two anionic compound(1 and 2)were prepared by coordination of(9,9?-dicarbazole)-3,3?,6,6?-tetracarboxylic acid with transition metal ions(Zn²⁺and Cd²⁺)in the condition of solvothermal.Both of them have good porosity and show blue fluorescence.Taking compound 1 as an example,the potential application of MOFs as an energy transfer system was further studied.2.Select 2?,5?-di(pyridin-4-yl)-[1,1?:4?,1??-terphenyl]-4,4??-dicarboxylic acid that containing both carboxylic and pyridine functional groups as organic ligand,a case of Zn(II)based compound 3 was prepared under the condition of solvothermal.Compound 3 showed strong blue fluorescence emission with a fluorescence quantum efficiency of 47.9%.