Nitrogen Heterocyclic Carboxylic Acid Type Assembly, Structure And Properties Of Metal Complexes

In this paper, we report four different series metal-organic complexes based on transition metal ions (ZnⅡ, CoⅡ, CuⅡ), alkaline earth metal ions (Sr", Ca"), rare earth metal ions(SmⅢ, NdⅢ) and organic compounds containing nitrogen heterocyclic carboxylic acid. the structures of all these compounds were determined by X-ray single crystal diffractometer, part of them have been characterized by Elemental analysis, Thermal analysis, Infrared spectra, Fluorescence spectra, Ultraviolet spectrum, and X-ray powder diffractometer.Firstly, utilizing2,2’-biquinoline-4,4-dicarboxylate ligand (Na2bqdc) and CoⅡ with2,2’-bipyridine as auxiliary ligand under hydrothermal condition produces a novel coordination polymer [Co(bqdc)·(bipy)·(H2O)]n (1). The molecular skeleton is bonded by bridging ligands to form a one-dimensional linear structure, and then double neighboring linear structures are furthermore linked by hydrogen bonds resulting in the formation of an interesting one-dimensional ladder structure. Finally with the strong supramolecular interactions π-π stacking lie in the structure. They are speculated to hold together the molecules into a three layer structure.Second, we introduce three new pyridine carboxylic complexes [Sr(bpdc)]n (2),[Cu(Hbpdc)]·C104(3),[Cu(H2bpdcClBr)·H2O]n (4). They are obtained from self-assembly of Cu" Sr" with2,2’-bipyridine-5,5’-dicarboxylic acid and2,2’-bipyridine-3,3’-dicarboxylic acid. Complex2displays a three dimensional structure. The TGA profiles indicates that there is no obviously chemical decomposition up to450℃. There are many kinds of different interesting hydrogen bonds in Complexes3. The interaction among hydrogen bonds and π-π stacking of the pyridine rings further constitutes a three-dimensional network structure. Complexes4is obtained by2,2’-bipyridine-3,3’-dicarboxylic acid and CuBr2, the local geometry of the central metals can be described as a cage configuration.Moreover, two new metal-organic complexes, namely,[Ca(Hpidc)-(H2O)2]n (5) Zn(Hpidc)2(H2O)2(6) are hydrothermally synthesized and characterized. X-ray diffraction indicates, complex5is a one-dimensional polymer. The central metal in complexe6is six coordinated, which connected by two water molecules, two nitrogen atoms from different imidazole groups and two oxygen atoms from carboxyl respectively. The framework is linked by these hydrogen bonds to form a three-dimensional structure.Finally, we synthetize two novel norfloxacin compounds [Nd(NFA)4(H20)2]-(C104)-H20(7),[Sm(NFA)2](NO3)(H2O)3]·3(NO3)·3H2O·bipy (8). They are obtained from self-assembly of Sm(NO3)3, Nd(NO3)3with norfloxacin which is a drug-resisitenace. In the crystalline structure of the compound7, the local geometry around central metal NdⅢ ion can be best described as a distorted dual cap square antiprism. Compound7contain many interesting nano-cavities, which have potentially adsorption effect. In compound8, the local geometry around central metal SmⅢ ion can be best described as a distorted cap square antiprism. To the best of our knowledge there is no report about rare-earth metal complex containing H-Norf as ligand.