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Synthesis And Structural Characterization Of Copper Coordination Polymers

Posted on:2006-09-02Degree:MasterType:Thesis
Country:ChinaCandidate:L GaoFull Text:PDF
GTID:2121360155452991Subject:Polymer Chemistry and Physics
Abstract/Summary:PDF Full Text Request
Metal-organic coordination polymers, a new kind of functional molecule materials, have attracted much more attention for their flexible tailoring, various topologies and promising applications in ion-exchange, adsorption, molecular reorganization, catalysts along with optics, electrics, magnetism and enantioselective separation. Coordination polymers may easily be affected by various factors, such as the environment of the metals, the structure of the organic-ligands, the appropriate reaction conditions, which may make a great change on the formation of the advanced structures. At the present time the synthesized coordination polymers have took on abundant structure topologies, for instance the one-dimensional linear chain, Zigzag chain, helical chain, rotaxane type, tow-dimensional honeycomb type, graphite type, square lattice type, stick and wall type, three-dimensional diamond and primitive cubic types and so on. Organic-ligands with the luxuriant structures play an important role in the construction of the coordination polymers, e.g. carboxylate type, pyridine type, -CN type and so on. At present, chemists have realized the construction of coordination polymers using two different kinds of organic-ligands with one metal ion or one organic-ligand assemblied with two different metals. Furthermore, the strategies for the synthesis of the materials are various, such as solvent volatilization, room temperature diffusion, hydrothermal solvent thermal, pillared method and so on. The reasons for why chemists focus on the research of the coordination polymers are not only for the seeking novel structures but also the potential application on many fields. Metal-organic coordination polymers with rigid open frameworks would be better performed in gas sorption and store than traditional zeolites because of their porous phases similar to inorganic zeolites. Moreover, the researches of coordination polymers have broken through in the field of NLO materials, molecular magnets, enantioselective separation and catalysts. According to the principle of crystal engineering, it is possible that rational design and synthesis of porous crystalline materials by selecting certain geometric metal ions and special organic ligands. At the same time, coordination polymers can be endowed with optics, electric, magnetism, enantioselective separation and catalysis by selecting functional metal ions and organic ligands with functional groups. This thesis based on the principle of crystal engineering, started with the consideration of the functions of the coordination polymers, try aims at designing and synthesizing functional metal-organic coordination polymers with novel topology and discusses the structural character and chemical and physical properties. We obtained three novel metal-organic coordination polymers: Cu(H2O)(1,3-BDC)·H2O, Cu3(2,2'-bipy)2(C8H4O4)2(C8H5O4)2 , Cu(I)Cu(II)(4,4'-bipy)1.5(C8H4O4)(C8H5O4). These compounds are composed of benzenecarboxylate, carboxylate, pyridine type ligands and copper ions, and characterized by signal-crystal X-ray diffraction, IR, differential thermal analysis and their magnetic susceptibilities. We prepared a novel layered coordination polymer in the mixed solvent thermal system using 1,3-BDC as organic-ligand and solved its structure by the signal-crystal X-ray diffraction. It crystallizes intetraganol symmetry with space group P4/nmm and a cell parameter of a = 19.1411(5) ?, c = 6.7881(2) ?, and Z = 8。The central atom Cu (II) is octahedral coordinated; the structural units were arranged just like airscrew shape and connected to form a open layered structure. This product was also characterized by IR, differential thermal analysis, inductively coupled plasma (ICP) analysis. We choose basic organic-ligand 2,2'-bpy and 4,4'-bpy, acidic organic-ligand 1,3-BDC and feasible reaction ratio to synthesize two novel coordination...
Keywords/Search Tags:Copper Coordination Polymers, Crystal Engineering, Structure, Magnetism
PDF Full Text Request
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