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Syntheses and Structural Characterization of Transition-metal Complexes Derived from Hydroxymethyl Pyrazole/triazole and Bipyrazole Ligands

Author: LiuHuiQin
Tutor: ZhangGuoFang
School: Shaanxi Normal University
Course: Inorganic Chemistry
Keywords: Double - pyrazole Pyrazolyl (c) thiazolyl methanol Transition metal complex Crystal structure Supramolecular self-assembly
CLC: O641.4
Type: Master's thesis
Year: 2007
Downloads: 89
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Abstract


The pyrazole (triazole) class ligand is a class of more complex multifunctional organic ligand than monodentate ligands bring richer chemical self-assembly. Pyrazole supramolecular assembly has potential applications in catalysis, biomimetic, magnetic, electronic transfer and photophysical properties, so the study of such ligand complex has an extremely important significance. The first part of the paper a brief introduction to supramolecular chemistry, the pyrazole class (triazole) ligand molecular self-assembly in the application of research progress. The second part of this thesis synthesized two kinds of dual-pyrazole ligand 3,3 ', 5,5' - tetramethyl -4,4 '- bis pyrazol (H 2 mdpz) 3,3 ', 5,5' - tetramethyl -4,4 '- methylene bis pyrazole (mbdpz H 2 ), under alkaline conditions with a variety of transition metal salts was synthesized ten new compounds by elemental analysis, infrared spectroscopy and other means were used to characterize the composition and structure of these ligands and complexes, ligand and cobalt complexes and studied by X-ray diffraction analysis methods 6 as a single crystal structure. The unit cell parameters are as follows: ligand 1 H 2 the mdpz · H 2 O belong to the tetragonal space group I4 (1) / acd with lattice parameters a = 24.8515 ( 16) (?), b = 24.8515 (16) (?), c = 14.9374 (12) (?). Complexes [Co (H 2 mdpz) 2 (H) 2O) 2 ] (the NO 3 ) < sub> 2 6 belong to the hexagonal system the space group P6/mcc, with lattice parameters a = 19.9217 (14) (?), and b = 19.9217 (14) (?), c = 16.2258 (17) (? ), γ = 120 °. The complex belongs to the common octahedral structure, entire complexes unlimited extension of the two-dimensional chain-like layered structure is formed. Between the layers through the hydrogen bonding of the nitrate anions is connected into a three-dimensional mesh structure. Complexes topology Kagomé (3 2 6 2 ). The synthesized two pyrazol third part (c) thiazolyl methanol 3,5 - dimethyl-1 - hydroxymethyl pyrazole (pzOH) and the 1 - (hydroxymethyl) phenyl and the triazole (btzOH), use them with The synthesis of a variety of transition metal salts of reaction of 11 kinds of new compounds, not been reported in the literature to obtain a single-crystal structure of a compound. The compound cell parameters are as follows: compound 19 belongs to the monoclinic system, space group P2 (1) / n, with lattice parameters with a = 8.2008 (12) (?), And b = 8.3865 (12) (?), C = 9.9672 (14) (?), β = 91.311 (2) °. Hydroxyl oxygen atom and a methyl group on the carbon atom to form a weak hydrogen bonding, to form a the R 12 (2) 4 ring. Synthesis of this thesis the two dual pyrazole polydentate ligand and two containing the topiramate (c) azole of N, O ligand, and the design and synthesis of the 21 new complex through physical chemical characterization of these new The structural features of the metal complexes, these laid the theoretical foundation for future people to study the nature of the type of ligand complexes.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Structural Chemistry > Complex chemistry ( coordination chemistry )
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