Synthesisand And Characterization Of Porous Metal-organic Frameworks Based On Dicarboxylic Acid

Metal-organic frameworks （MOFs） is an organic-inorganic hybrid solid, the orderlyframework structure is the coordination polymers connected to the organic ligands （mostlyaromatic polyacid and pyridine type） and inorganic metal node （or metal clusters）.MOFs has the advantage of good chemical stability, high porosity, large surface area, avariety of coordination structure etc. as a potential new functional molecular materials. Theseadvantages make it have potential application in the heterogeneous asymmetric catalysis,gases and organic molecules adsorption and separation, drug inhibitor, biomedical imagingetc., also make it have become one of a hot spot direction in the field of materials science. Wedesign and synthesis a series of special features and functionalization of the organiccarboxylic acid and the bipyridine compound, and make them coordinate with the transitionmetal to assembled into metal-organic frameworks compound with the specific structure, andstudy the basic performance. These results will be introduced from the following parts:The first part: briefly introduced course of development, coordination mode, secondarybuilding units of the coordination compounds, structural design, synthesis methods andinfluencing factors of the MOFs and applied in the gas separation and adsorption, multiphaseasymmetric catalysis, fluorescence, and drug delivery etc.The second part: By using rigid V-shaped dicarboxylate and different bridging pyridineclass compound, synthesized four porous zinc metal-organic frameworks. By single-crystalX-ray diffraction test proved the structural formula of the compound （1） is[（Zn₂·TC₂·4,4′-BPY·2DMF）·2DMF], possess the triple interspersed structure. By comparisonwith PXRD map, it shows that the four compounds are dual ligand coordination; Know fromcompounds （1）,（2）’s peak shape, proportion of reactant on the framework of compoundstructure has a certain influence. The thermal stability of the compounds was studied by TG,and show that the compounds have a high thermal stability, and the compound （2）,（3） havinga larger pore structure.The third part: By using rigid V-shaped dicarboxylate and bridging pyridine classcompound, synthesized four porous cadmium metal-organic frameworks. But when coordinated with cadmium ion, bridging pyridine class compound don’t participate in thecoordination, so failed to resolve that if too much solvent molecules contained in the poreswill lead to the problem of the crystal’s weak diffraction spot. Meanwhile, by PXRD analysisfound that the solvent has a great influence on the reaction system. The thermal stability ofthe compounds was studied by TG, and show that the compounds have a high thermalstability.The fourth part: we designed and synthesized six functional organic ligands （TC-NH₂、TC-NO₂、TC-OH、3,3′-BMBPY、L、H₂Thz）, identified the structures by the MP,1H NMR and（13）^C NMR, tried to synthetic metal organic framework compounds with these ligands, andpreliminarily explored the reaction conditions.