Syntheses, Structures And Properties Of Complex Constructed By Carboxyl Acid And 2,2’-bipyridine

The rational design and construction of metal carboxylate coordination polymers became an intererting research field not only from the intriguing structural diversity but also from the demand for applications of functional materials in the fields of magnetism, catalysis, gas storage and separation, luminescence and so on. In particular, carboxylate ligands have been frequently employed to engage in diverse bonding modes, allowing wide structural diversity and the ta iloring of physical properties such as magnetism and porosity. And the complexes with dipyridylamine ligand also had extensive researches and potential applicationas. In this paper, we mainly studied the reaction of transition metals with carboxyl acid and 2,2’-bipyridine to investigate the influence of the different substituents on properties and construction of coordination frameworks. Sixteen coordinated polymers have been synthesized on the basis of hydrothermal synthesis methods and characterized by X-ray single crystal analysis,IR spectra, elemental analysis, thermal analysis, fluorescence spectroscopy and magnetic susceptibility measurement.1. Four novel metal complexes with the ligand 2,2’-dipyridylamine were synthesized and characterized by elemental analysis, IR, X-ray crystal diffraction and thermogravimetric analysis. The four complexes all b elong to triclinic system with space group P-1, and they had similar cell parameters. The crystal packing pattern showed that the four complexes form the two-dimensional plane structure by hydrogen bonds. We also studied the fluorescent property of two complesxes.2. I had reacted 2,2’-dipyridylamine and Mn, then employed oxalic acid, isophthalic acid and terephthalic acid as an auxiliary ligand respectively, which feature three structures, namely {MnⅡ(dpa)(C2O4)}n(5), {MnⅡ(Isoph)(dpa)}n(6) and {MnⅡ(Isoph)(dpa)}n(7). Variations in the molecular self-assembly were influenced by substituted group of the organic- ligand in the bridging ligands. I had investigated the syntheses, crystal, thermal stability, XRD, IR and elemental analysis. We also had studied the magnetic properties of complex 5 and found that the complex 5 had antiferromagnetic.3. Three Cd complexs {Cd2(dpa)2(o-BDC)2(H2O)2}(8), {Cd(dpa)(m-BDC)}n(9) and {CdⅡ3(dpa)2(p-BDC)6}n(10) were synthesed by hydrothermal reactions. We also had investigated the syntheses, crystal, thermal stability, XRD, IR and elemental analysis. In this part, we found that the location of functional groups substituent had a great influence on the formation of the complexes.