| In recent years, Metal-organic framework material is a new kind of flexible design, with a wide range of potential applications of hybrid materials, such as:gas adsorption and separation, magnetism, nonlinear optics, drug delivery, ion recognition, catalysis and other fields, has attracted many researchers’great interest.In this paper we use four carboxylic acid (H2tbtpa, H2ndc, H2L1 and H2L2) ligands, the iminazole ligand as for the second ligand, with the Zn(Ⅱ)、Cd(Ⅱ)、Co(Ⅱ)、 Ni(Ⅱ) ions synthesis twenty-two kinds of interesting metal-organic polymers under the hydrothermal conditions. And some of the complexes were analyzed by X-ray diffraction, X-ray powder diffraction, thermal analysis, elemental analysis, infrared analysis and characterization, discussed the synthesis conditions of these metal organic coordination polymers and the structure features, analysis of the topology of their type, with the weak interaction between the molecules within the structure. (hydrogen bonds and π...π interaction), to explore the relationship between material with structure and performance. This paper is divided into five chapters, each chapter is as follows:The first chapter is the introduction, briefly introduces the coordination chemistry, coordination polymers and other basic concepts, research background, development process, and the influence of various factors with the structure, the main synthesis methods.In the second chapter, we use the H2tbtpa acid ligand as the first ligand, with the Zn, Cd ions synthesis eleven kinds of interesting metal-organic polymers under the hydrothermal conditions. By X-ray single crystal diffraction structure analysis of crystal structure, in these compunds which contains a two-dimensional layered structure, self penetrating metal ligand coordination polymers,3D structure. Complex 2,3 and 4 are the isomer by regulating the different proportions of four bromo acid ligands, and belong to the space group P-1, by changing the ratio of the reactants, the configuration of complex can be regulated. Complex 10 and 11 are complex isomers of solvent induced by controlling the reaction conditions, especially the choice of solvent has an important influence on the structure of the final product.In the third chapter, we use the H2ndc acid ligand synthesis four kinds of polymers. Complexes 12,13,14,15 are the three-dimensional structure, through the structure analysis of the aromatic ligand and ligand imidazole substituent effects produced by the different structures of the complexes, Complex 12,13 respectively is 3-fold pcu with the topological structure of network and 5-fold with typical dia the network topology structure, and the complex 14 is a 4-linker is relatively rare (65.8)-hxg-d type topology, differential fluorescence behavior at the same time also studied the different auxiliary ligands leads to the.In the fifth chapter, we have designed the flexible two carboxylic acid content of two was synthesized by (H2L1, H2L2), through which the self-assembly with transition metal ions, and synthesis eight kinds of polymers. Their structures were elucidated by X-ray single crystal diffraction structure analysis, analysis of their network topology characteristics. Study found that these structural diversity, complexes 20、21、25、26 are two dimensional multilayer structure, wherein the flexible Carboxylate Ligands in coordination to trans conformation or at the same time take CIS two conformers, metal organic macrocycles 22 and its structure is zero dimensional. Complex 23 is the zero dimensional nano cage structure with flexible carboxylate ligands adopt a cis conformation. Complex 24 is a two-dimensional network structure with multiple, flexible ligand diversified configuration is main reason resulting in complex structure diversification. |
PDF Full Text Request