Synthesis, Characterization And Properties Of Aromatic Polycarboxylates Rare Earth Coordination Polymers With Micro/nano一structures

Metal-organic coordination polymers have become one of the research hotspots in the fields of coordination chemistry and material chemistry due to their extensive application prospects in the fields of luminescence, gas storage, absorption, catalysis, sensor and magnetic materials. Compared with the transition metal complexes, lanthanide coordination polymers have the properties of diverse topological structures and special properties of optical, electrical, magnetic and catalytic, which make them popular among the researchers in the relevant field both at home and abroad. However, controllable synthesis of coordination compounds is still a huge challenge due to the influencing factors such as temperature, time and auxiliary ligand in the synthesis process. In this thesis, some lanthanide coordination polymers were synthesized by using the synthesis methods of solvothermal and microwave, whose structures and properties were also studied. This work may provide method and theoretical basis for the synthesis of other coordination polymers.The main contents of this thesis are as follows:(1) Straw-sheaf-like terbium-based coordination polymer architectures: Microwave-assisted synthesis and their application as selective luminescent probes for heavy metal ionsWith the assistance of microwave, straw-sheaf-like terbium-based coordination polymers were synthesized quickly by using H4 BTC as organic ligand. This method is quick, moderate and environmentally-friendly. A possible mechanism responsible for the formation of the straw-sheaf-like hierarchical architectures was proposed. Besides, the author discussed the fluorescence properties of terbium-based coordination polymer architectures, and their ability of detecting heavy metal ions, especially for lead ion.(2) Gadolinium and other rare earth coordination polymer hollow microspheres: solvothermal preparation and characterizationThrough a solvothermal process, gadolinium-based coordination polymer hollow microspheres were synthesized without any template or surfactant employing 2-amino-1,4-benzenedicarboxylic acid(H2ATPA) as the organic building block. The amino group is an electron-donating group and metal ions often accept electrons, so amino group can be used as binding site to bind with metal ions in coordination polymers. Meanwhile, the influence of reaction conditions on the structure and shape of the products was also investigated. In addition, the coordination polymers with other rare earth elements were also synthesized and characterized. The formation mechanism and fluorescence properties of the hollow microspheres were also discussed.(3) Gadolinium and other rare earth coordination polymer spheres: preparation and characterizationAs a reaction medium, mixed solvent has been widely used in the synthesis of inorganic materials of various morphologies. The composition of solvent has great impact on the morphology and phase of products. By changing the composition of reaction solvent, gadolinium-based coordination polymer solid spheres were obtained using 2-amino-1,4-benzenedicarboxylic acid as organic ligands. In addition, the coordination polymers with other rare earth elements were also synthesized and characterized. The fluorescence properties of the coordination polymers were also discussed.