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The Synthesis and Crystal Structures of Transition Metal-Azole Coordination Polymers

Author: ZhangHaiYan
Tutor: YueFan;WangJiDe
School: Xinjiang University
Course: Chemical Engineering and Technology
Keywords: Azole ligand coordination polymers heterometallic fluorescence
CLC: O621.13
Type: Master's thesis
Year: 2011
Downloads: 58
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Abstract


It is still a challenge for chemical workers to construct some coordination polymers with certain structure and special functions by combing small inorganic molecules and organic ligand with chemical self-assembly technique. The main goal of this thesis is exploring the synthesis regulation, structure and characteristic of these complexes.Ten single crystals of new complexes were obtained by hydrothermal method or solvent evaporation method. Most of these complexes were characterized by single crystal X-ray diffraction, IR, thermogravimetry/differential thermal analysis, X-ray power diffraction analysis, elemental analysis, and fluorescence spectrum analysis.In the thesis, we synthesized complexes with four kinds of organic ligands, that is 1,3-dicarboxymethyl-benzimidazole(bcbi),2-methyl-1,3-dicarboxymethyl-benzimidazole(mbcbi),4-amino-1,2,4-triazole(atrz),4-amino-3,5-dimethyl-1,2,4-triazole(admtrz). Five complexes were synthesized [Zn(bcbi)2·4H2O]·H2O (1), [Cu(bcbi)2·4H2O]·H2O (2), [Mn(bcbi)2·4H2O]·H2O (3), [Zn(mbcbi)2·4H2O]·2H2O (4), [Cu(mbcbi)2·4H2O]·2H2O (5) by solvent evaporation method built on 1,3-dicarboxy- -methyl-benzimidazole and 2-methyl-1,3-dicarboxymethyl-benzimidazole ligand. In the copper complex, center metal ion is octahedron configuration when bcbi was used, while Cu2+ is square planar when mbcbi used. Besides, the ligand have different space structure, the two arms of carboxymethyl are in both sides of benzimdazole ring plane in bcbi, but in mbcbi, 2-methyl-substitute in benzimidazole ring the two arms of carboxymethyl are in the same side of plane as result of the electron cloud evenly disperting across the benzimidazole ring. The zinic complex 1 and 4 have strong fluorescence at room temperature in solid state, while copper complex 2 and 5 have a catalytic effection with tetrahydrofuran, which was oxidized by H2O2 in the presence of 2 or 5 as catalyst. The structure may change accordingly when the molar ratio of M/L changed. A 1D chain [Zn2(tp)2·4H2O] (6) was received when the ratio of Zn2+:tp is 1:1, while a 2D network based on polynuclear unit [Zn(tp)·H2O]n (8) formed when the ratio was enlarged into 2:1. Replacing Zn2+ with Cd2+, afforded (7), a 2D plan structure constructed by parallel straight chains.A novel coordination polymer [Zn6(tp)5(atrz)2·2OH]·2H2O (9) was prepared by hydrothermal method, when ethylenediamine in replace of NaOH was added. Terephthelate and 4-amino-1,2,4-triazole as mixed ligand and both of them act as bridging ligand, which combine with Zn2+ and make up hexanuclear unit. For the varieties of terephthelate’s coordination modes, the structure takes on split-level and noninterpenetrating 3D network. The luminescence spectrum illustrate that it has strong fluorescence emission intensity in solid state.A novel structure with mixed ligand terephthelate and 4-amino-3,5-dimethyl-1,2,4- -triazole (admtrz), [Co4(tp)3(admtrz)4·7H2O·2OH]·(0.5H2tp)·7H2O (10) was prepared by solvent evaporation method. The coordination polymer is a 1D chain consist of tetra-nuclear unit which looks like an alternate branches and leaves. One of double nuclear form branches and another double nuclear form leaves.Mixing Zn2+ with Co2+ as well as two different ligands (one of them is 4-amino-3,5 -dimethyl-1,2,4-triazole ligand, and another is NH4SCN inorganic anion ligand), two single crystals were precipitated in the same system by solvent evaporation method. One is a mononuclear compound [Co(admtrz)2(NCS)2] (11), and another is heteropolynuclear coordination compound [ZnCo2(admtrz)4(NCS)6·2H2O]·2H2O (12). 11 is a blue crystal with mononuclear unit and crystalized before 12, 12 is a pink crystal consist of trinuclear unit includes two znic ions and one cobalt ion, we guess the progress is a dinamic conversion, from mononuclear structure to more stable trinuclear configuration.

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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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