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Syntheses and Characterizations of Coordination Polymers Containing Bis-imidazole Ligands

Author: WangJing
Tutor: LangJianPing
School: Suzhou University
Course: Inorganic Chemistry
Keywords: Bisimidazole ligand Coordination polymers Synthesis Crystal structure Fluorescence
CLC: O633.5
Type: Master's thesis
Year: 2011
Downloads: 31
Quote: 0
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Abstract


Containing bisimidazole flexible organic ligands with good complexing properties, coordination mode is relatively abundant, more coordination sites, and the manner of the ligand having a variability and molecular deformation resistance with adjustable resistance, obtained by the reaction of metal complexes in catalytic adsorption, separation, and fluorescence potentially wide range of applications. Therefore, the design has a different length of space containing flexible ligand with various types of metal salts Bisimidazole self-assembly can not only enrich the structural chemistry of such complexes, but also conducive to explore a new type of function compounds. We selected the the flexible Bisimidazole ligand 1,1 '- (1,6-hexanediyl) bis-1H-benzimidazole (hbbm) self-assembly and IIB metal salts, seven and one-dimensional, two-dimensional and three-dimensional coordination polymer , and the characterization of their structure, testing the product element analysis, IR spectroscopy, thermal gravimetric analysis and fluorescence properties. The main content of the paper is as follows: 1) the development of coordination polymers containing imidazole reviewed. 2) with the ligand hbbm Group IIB metal halide to give the five compounds [ZnCl 2 (hbbm)] n (1), [ZnBr 2 (hbbm)] n (2), [CdCl 2 (hbbm) 2 ] n (3) [CdI 2 (hbbm) · 0.5H2O] the n (4), and [HgI the 2 (hbbm)] n (5). Compounds 1, 2, 4 and 5 by hbbm ligand and MX2] Nuclear (1: M = Zn, X - = Cl; 2: M = Zn, and X = Br; 4: M = Cd, X = I and 5 : M = Hg, X = I) alternately connected to form a one-dimensional chain structure. Compound 3, diamond [Cd4Cl8 (hbbm) 4] unit a hbbm connection (4,4) is formed grid 2D structure. Compounds 1-5 with hbbm ligand compared to fluorescent obvious redshift. 3) ligands hbbm with Cd (OAc) 2 · 2H2O and Zn (OAc) 2 · H2O reaction, respectively [Cd3 (η, μ-OAc) 2 (μ-OAc) 2 (OAc) 2 (hbbm) 2 for the formation of three core units dimensional double-stranded coordination polymer [Cd3 (η, μ-OAc) 2 (μ-OAc) 2 (OAc) 2 (hbbm ) 2 ] n (6) and completed by the U-shaped one-dimensional chain woven 1D → 3D three-dimensional extension of the coordination polymers [Zn 2 (μ-OAc) 4 (hbbm)] n (7). Compounds 6 and 7 than hbbm ligand fluorescence obvious redshift.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Miscellaneous Chain Polymers > Heterocyclic polymer chain (chain polymer containing heterocyclic )
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