Synthesis, Structure And Properties Of Coordination Polymers Based On Pyridine-2,5-Dicarboxylic Acid

In recent years, with the rapid development of crystal engineering and topology, more and more researchers have been attracted on coordination polymers due to their intriguing architectures and potential applications in light, electricity, magnetism. Therefore, it remains a challenge for chemists to synthesis functional materials through selecting appropriate organic ligands, metal ions and controlling the reaction conditions.In this paper, two novel fuctional coordination polymers by selecting transition metal Cu(Ⅱ) and Ag (Ⅰ) as templates, N-containing polycarboxylate ligand as ligand have been hydrothermally synthesized and characterized by IR spectra, single crystal X-ray diffraction. The thermal stability, fluorescence properties and electrical conductivity were investigated.In this paper, we select transition metal Cu(Ⅱ) and Ag (Ⅰ) as central metal, pyridine-2,5-dicarboxylic acid,1,10-phenanthroline as ligand successfully synthesis coordinated polymer [Cu4(pydc)4(phen)2(H2O)2]n(1) [Ag(Hpydc)(phen)(H2O)]n(2), (2,5-pydcH2=pyridine-2,5-dicarboxylic acid, phen= 1,10-phenanthroline).Besides, we have an investigation and optimization in effect factor for the synthesis of the complexs such as reactant ratio, reaction temperature, pH value and the solvent.By the X-ray diffraction structural analysis it reavals that the two complexs both are triclinic and belong to P1- space group.The thermal stability, fluorescence properties and electrical conductivity of the coordination polymers were tested respectively, the result reavals that the framework of [Cu4(pydc)4(phen)2(H2O)2]n is stable under 280℃, fluorescence properties become strong compared to ligand, also has semiconductor properties. The framework of [Ag(Hpydc)(phen)(H2O)]n is stable under 280℃, fluorescence properties become strong compared to ligand, also has insulation properties.