Syntheses And Properties Of Transition Metal Complexes Constructed From N-containing Carboxylic Ligands

The research content of this thesis is to synthesize transition metal complexes with novel structure and characteristic function by reacting transition metal ions with nitrogen-containing organic carboxylic acid ligands under hydrothermal or solvothermal conditions,and to analyze the crystal structure and elemental analysis,infrared spectrum,UV-Vis absorption spectrum,thermogravimetric analysis,XRD and other basic properties of a series of transition metal complexes.By selecting different organic carboxylic acid ligands,types of metal ions,reaction solvents and reaction temperatures,etc.to adjust the pore shape,size and crystal dimensions of the coordination polymer,transition metal complexes with novel structures and excellent properties were obtained,and also the corresponding regulation laws to guide the targeted synthesis of subsequent coordination polymers and predict their related performance and application were summarized.The potential application of the complexes in the fields of magnetism,fluorescence probe and dye adsorption was studied.The structural characteristics of coordination polymers,the influence of coordination mode of organic carboxylic acid ligands on the selective detection of phenolic nitro explosives,the detection and removal of organic dyes,and the fluorescence quenching and dye selective adsorption of complexes caused by the interaction of organic pollutants and complexes was also discussed.The main research work is as follows:1.The first chapter of the thesis mainly introduces the research significance of topic selection,domestic and foreign research background and development trends,and current research progress of metal coordination polymers in related fields such as magnetism,fluorescent probes,dye adsorption and catalysis.2.In the second chapter,four new coordination polymers have been synthesized based on the main pyridine carboxylic acid ligand2,2':6'2"-terpyridine-4'-carboxylic acid?Hctpy?,and different auxiliary ligands?H₃btc=1,3,5-benzenetricarboxylic acid,H₂suc=succinic acid,4,4'-bipy=4,4'-bipyridine?,reacting with transition metal Cu?II?under solvothermal conditions.The compounds 1-4 were characterized by elemental analysis,thermogravimetric analysis,FT-IR,UV-Vis spectroscopy,and powder X-ray diffraction.Complex 1 has an OD structure,and finally forms a3D network framework structure through a series of hydrogen bonding interactions;Complex 2 has a 1D chain structure,and forms a 3D network frame structure through the cross-action of hydrogen bonds;Complex 3 has an 0D structure and finally forms a 2D layered structure through the interaction of hydrogen bonds;Complex 4 displays a 1D chain structure;At the same time,the magnetic properties of some complexes were studied.3.In the third chapter,three coordination polymers have been synthesized by using pyridine carboxylic acid ligand2,2':6'2"-terpyridine-4'-carboxylicacid?Hctpy?and4'-?4-carboxyphenyl?-2,2':6',2"-terpyridine?Hcptpy?ligand as main ligands and different auxiliary ligands?H₂suc=succinic acid,H₂bdc=1,4-benzene dicarboxylic acid?,reacting with transition metal Zn?II?under solvothermal conditions.The compounds 5-7 were characterized by elemental analysis,thermogravimetric analysis,FT-IR,UV-Vis spectroscopy,and powder X-ray diffraction.The 1D chain structures of the complexes 5 and 6 form a 2D layered structure through?···?interaction.The complex 7 is a 1D chain structure and forms a 3D supramolecular network framework through hydrogen bonding.At the same time,the application of compounds 5 and 6 in the field of fluorescence sensing and dye adsorption was investigated in detail.Based on the structural characteristics of the complexes 5 and 6,the mechanism of recognition and adsorption was explored.4.In the forth chapter,two new coordination polymers have been synthesized based on the main ligand 2,2':6'2"-terpyridine-4'-carboxylic acid?Hctpy?,and different auxiliary ligands?H₂suc=succinic acid,H₂bdc=1,4-benzene dicarboxylic acid?,reacting with transition metal Mn?II?under solvothermal conditions.The coordination polymers 8-9 were characterized by elemental analysis,thermogravimetric analysis,FT-IR,UV-Vis spectroscopy,and powder X-ray diffraction.Compound 8 is a 1D chain structure and forms into a 3D network framework through the hydrogen bonding interactions;Compound 9 is a 1D chain structure and forms a 2D layered structure through hydrogen bonding.5.The fifth chapter of the thesis is conclusions.