Syntheses, Structure And Properties Of2,2’-Bipyridine-6,6’-Dicarboxylate Complexes

The design and synthesis of particular structure and good performance are research hotspot in the coordination chemistry, supramolecular chemistry, materials chemistry, crystal engineering recently. Not only due to their novel topological structures, but also for their huge potential applications in the optoelectronic materials, magnetic materials, fluorescence device materials, bio-medical materials, gas storage, adsorption, molecular recognition. The dissertation is aimed to synthesize transition and/or lanthanide coordination complexes of2.2’-bipyridine-6,6’-dicarboxylate with excellent photophysical properties. Under hydrothermal or solvothermal conditions,21lanthanide and/or transition coordination compounds with2,2’-bipyridine-6.6’-dicarboxylate and other carboxylate ligands were constructed. All of these are characterized by X-ray single crystal diffraction, IR spectra, elemental analyses and TGA analysis. The magnetic property of dinuclear DyIII compunds was investigated by variable-temperature susceptibility. The luminescent property of DyIII, TbIII, PrIII, NdIII, YbIII compounds in visible and near-infrared region, respectively, was also investigated. This dissertation includes the following five chapters.Chapter1:The concepts and principles of coordination chemistry, coordination polymers, synthesized methods, and research hotspots are simply introduced. Then, advance of the luminescence and single-molecule magnets (SMMs) on lanthanide organic complexes are briefly reviewed.Chapter2:Seven lanthanide coordination compounds (1-7) have been synthesized by the reaction of lanthanide chloride with2,2’-bipyridine-6,6’-dicarboxylic acid. Their crystal structure and thermal stability have been discussed. The magnetic behavior of complex2was investigated, and it is found to be a single molecule magnet (SMM). Coordination compounds1,2and5exhibit good luminescence properties in visible region, whereas7shows good NIR luminescence property.Chapter3:Seven new lanthanide coordination compounds (8-14) were constructed from lanthanide ions with2,2’-bipyridine-6,6’-dicarboxylic and oxalic acids under hydrothermal conditions. The structures are3D networks (8,9and10),2D layers (11,12),1D chain (13) and binuclear (14). The NIR photoluminescence properties of coordination polymers10and13are studied.Chapter4:Six new lanthanide coordination polymers (15-20) were constructed from lanthanide ions with2,2’-bipyridine-6,6’-dicarboxylic and aromatic dicarboxylic acids under hydrothermal conditions, which have3D and2D structures, respectively. All of their thermal stabilitys and fluorescence properties were investigated and compounds17and20show good luminescence in near-infrared region.Chapter5:One new ZnII-YbIII heterometallic coordination compound was synthesized by the reaction of zinc chloride, ytterbium chloride and2,2’-bipyridine-6,6’-dicarboxylic acid under hydrothermal condition. The crystal structure was determinated and luminescent property has been discussed in visible and near-infrared region.