Synthesis,Structure And Characterization Of Metal Complexes Of Pyridine Dicarboxylate

The selection of organic ligand has a decisive influence for the structure of coordination compound during the synthesis process.The integration of pyridine dicarboxylate into the framework of complexes can form coordination compounds with various configurations and novel structures.And these coordination compounds have potential applications in optical,electrical,thermal,magnetic and other functional materials.In this thesis,the ligands containing pyridine dicarboxylate were selected,and seven complexes with novel structure were synthesized mainly by solvothermal method.The compositions and structures of the obtained complexes were characterized by elemental analysis,X-ray powder diffraction analysis,X-ray single crystal diffraction,infrared spectra and thermal analysis.And the luminescent,magnetic and photocatalytic properties of the complexes were explored.The main contents are as follows:(1)Two complexes[Pb(?-pda)]_nand[Bi(?-pda)(H₂O)Cl]_nwere synthesized with pyridine-2,6-dicarboxylic acid(H₂pda)as ligand.Both[Pb(?-pda)]_nand[Bi(?-pda)(H₂O)Cl]_nare coordination polymers bridged by the carboxyl groups in pda^2–.The fluorescence spectra results show that[Pb(?-pda)]_nhas good photoluminescence property.The results of photocatalytic activity studies show that[Bi(?-pda)(H₂O)Cl]_nexhibits better active for the decomposition of organic dye rhodamine B.And the degradation ratio is 77%.(2)The complex[Cu(5,5?-bpdc)(phen)]_nwas synthesized with 2,2?-bipyridine-5,5?-dicarboxylic acid(5,5?-H₂bpdc)as the main ligand and 1,10-phenanthroline(phen)as the anauxiliary ligand.[Cu(5,5?-bpdc)(phen)]_nbelongs to monoclinic crystal system and space group P2₁/c,and is a coordination polymer with structure of zigzag chain.(3)Three complexes[Mn(6,6?-bpdc)(phen)(H₂O)]·H₂O,[Ni(6,6?-bpdc)(H₂O)₂]and[Bi(6,6?-bpdc)(H₂O)(?-Cl)],with 2,2?-bipyridine-6,6?-dicarboxylic acid(6,6?-H₂bpdc)as the main ligand,were synthesized by solvothermal method.Among these three complexes,[Mn(6,6?-bpdc)(phen)(H₂O)]·H₂O and[Ni(6,6?-bpdc)(H₂O)₂]are mononuclear monomer complexes,and[Bi(6,6?-bpdc)(H₂O)(?-Cl)]is a dinuclear monomer complex.The fluorescence results show that[Mn(6,6?-bpdc)(phen)(H₂O)]·H₂O has good photoluminescence property.However,fluorescence quenching occurs in[Ni(6,6?-bpdc)(H₂O)₂]compared with ligand.The results of photocatalytic activity studies show that[Bi(6,6?-bpdc)(H₂O)(?-Cl)]exhibits better active for the decomposition of organic dye rhodamine B.And the degradation ratio is(4)A complex{(C₁₂H₉N₂)[Bi Cl₄]}_nwas synthesized with 1,10-phenanthroline as ligand.The complex{(C₁₂H₉N₂)[Bi Cl₄]}_nis a coordination polymer with infinite chain structure.The results of photocatalytic activity studies show that{(C₁₂H₉N₂)[Bi Cl₄]}_nis an efficient catalyst for the photocatalytic degradation of organic dyes rhodamine B and methylene blue.