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Synthesis, Structures and Properties of the Functional Complexes Constructed from 2-Propy-1H-Imidazole-4,5-Dicarboxylic Acid

Author: ZuoLiHua
Tutor: HouHongWei；LiGang
School: Zhengzhou University
Course: Inorganic Chemistry
Keywords: Coordination polymers The imidazolyl hydroxy acid ligands Crystal structure Thermal performance Fluorescent properties
CLC: O621.13
Type: Master's thesis
Year: 2010
Downloads: 43
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Abstract


2 - propylimidazolium -4,5 - dicarboxylic acid ligands with transition metal or main group metal ion by Hydrothermal Method the nine novel structure of the complexes, and their synthesis, crystal structure and fluorescent properties and thermal stability and UV spectra were studied. First, the 2 - propyl imidazole-4 ,5-dicarboxylic acid (H3L) and Cd (II), Ni (II), Co (II) or Mn (Ⅱ) ion by hydrothermal reaction of four single-core complexes: [Cd (H2L) 2 (2,2 '-bipy)] (1), [Ni (H2L) 2 (H2O) 2] (2) [Co (H2L) 2 (H2O) 2] (3 ) and [Mn (H2L) 2 (H2O) 2] (4) Meanwhile, the ligand H3L with Co (II) ions in the presence of an organic nitrogen-containing ligand 2,2 '-bipy the presence of, by hydrothermal reaction a novel structure tetranuclear complex: [Co4 (L) 4 (2,2 '-bipy) 4] (5). 1-5, the central metal Cd (II), Ni (II), Co (II) or Mn (II) ion is hexacoordinated environment, and to form a distorted octahedral geometry. Secondly, of H3L with the main group of Ca (II), Sr (II), Ba (II) or Pb (Ⅱ) ions by hydrothermal reaction four novel coordination polymer structure: [Ca (H2O) 2 ( HL)] n (6), [Sr (H2L) 2 (H2O) 2] n (7), [Ba (H2L) 2 (H2O) 3] n (8) and [Pb3 (HL) 3] n (9 ). 6 ligand H3L are involved in the coordination the μ5-η8 mode, this coordination mode is very rare, each ligand H3L eight teeth bridging mode five Ca (Ⅱ) ion to form a 3-D coordination polymer; 7, each Sr (Ⅱ) ion is N206 eight-coordinated dodecahedral configuration, which the ligand H3L is μ2-η3 mode involved in the coordination, connection Sr (Ⅱ) ions form 2 - D mesh structure; 8, Ba (II) in 07 seven ligands monocapped octahedral type, H3L to μ2 pattern connection Ba (II) ions to form a long chain structure of the 1-D; in 9, with bodies involved in coordination, the H3L based on the μ4-η7 mode based on the coordination mode of each ligand H3L seven-tooth pattern bridging four Pb (Ⅱ) ions form a three-dimensional coordination polymer. Finally, to test the thermal decomposition performance of these complexes in an air atmosphere, and analysis of their thermal stability. Testing of the solid-state fluorescence spectra, and to explore the luminescence mechanism. The results showed that: the transition metal complex object 1-4 fluorescence spectra belong to the perturbation of the metal ion of the organic ligand fluorescence, belong to the L * → L emitting; main group metal complexes 6-9, 6 and 8, the fluorescence emission The peaks can be explained as a ligand to a charge transfer transition between the central metal ion luminescence, the internal charge 7, the fluorescence emission peaks as a ligand transition emitting; fluorescence emission peak of the complex 9 from the ligands after the π-π * transitions and the ligand after the metal perturbation n-π * transitions. Complexes 1-9 in the UV spectrum, the absorption peaks can be attributed to a ligand π-π * absorption band appears.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Theory of organic chemistry,physical organic chemistry > Organic Chemistry Structure Theory
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