Synthesis, Structure And Postsynthesis Of Metal Organic Frameworks Based On2,2’-bipyridine-5,5’-dicarboxyl Acid

Metal-organic Frameworks with fantastic structures and various tunable porousstructure is various potential applications, such as in gas storage and separation ofgases, chiral separation, magnetism, catalysis, and luminescence. In the last twocades, a number of novel, outstanding performance in physical and chemicalproperties MOFs material emergers. Yaghi and others found a good hydrogen storagematerials, this research show MOFs have great potential application of industry. Inrecent few years, an efficient method named Postsynthetic Modification （PSM） hasaroused great interest of chemistry and material scientists. hese kinds of strategy canlead to directional modification in fixed position which made it more advantageousthan the traditional methods in improving the physical and chemical properties ofMOFs materials. As reported in recent years, the approach of PSM is mostlyaccomplished through the introduction of external functional groups. LuminescentMOFs have attracted attention for some time for their hybrid nature includes both anorganic ligand and a metal ion within a （typically） porous structure. This featureenables it a wide range of emissive phenomena found in few other classes of material.The main modes for generating luminescence in MOFs are linker, framework metalions and adsorbed lumophores. However by now majority of the literature reports arelimited to the presentation of luminescence spectra. In recent reports, discussions ofguest-dependent response are growing and rational modification of luminescentproperties for specific sensing applications is beginning to emerge.According to the principle of crystal engineering, we have focused our studies on thesynthesis,structure postsynthesis and luminescence. In this paper, we choose ligand2,2’-bipyridine-5,5’-dicarboxylic acid as ligand to design new structure. Furtherthrough postsynthesis experiment, three different solid materials （compound9a,9band9c） were obtain. In our paper, we obtained9compounds, Cu₄（Hbpydc）₄Cl₄·2H₂O（1）, Zn（bpydc）₂·2H₂O（2）, Ni（bpydc）₂·2H₂O（3）, Co（bpydc）₂·2H₂O（4）, Mg（bpydc）₂·2H₂O（5）, Zn（bpydc）（DMSO）（6）, Cd（bpydc）·H₂O（7）, Pr2（bpydc）3·4H₂O（8）, In（bpydc）₂（9）. Compound1exhibite zero-dimensionalr structure. Every molecular containstertranuclear coppers secondary building units. Magnetic characterization indicates that the compound exist antiferromagnetic and ferromagnetic two kinds of magnetic exchange interaction. Single crystal structure shows that compound2-5is isomorphic two-dimensional layered compounds. The structure of the compound6-8is three-dimensional. In compound6, every single Zn atom is chelatedwith one H₂bpydc, afterthe removal of solvent molecules in DMSO, compound6contained a fusiform pore. In compound7, only part of H2bpydc is chelated with Cd ions. Compound7containsa three-dimensional circular pore. Compound8is a dense structure. Compound9is a four fold diamond-like interpenetrate structure and the N atoms of H₂bpydc isn’t chelated. Take advantage ofthis features, three different solid materials （compound9a,9b and9c） were obtain The luminescence spectra show the material have a tunable property in luminescence.