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Synthesis, Structures and Properties of New Coordination Polymers Based on 4’-(4-Pyridyl)-terpyridine

Author: WangBaoCheng
Tutor: HuHuaiMing
School: Northwestern University
Course: Physical and chemical
Keywords: 4 - pyridyl substituted terpyridine Coordination polymers Transition metal ions Fluorescence Properties The nature of the thermal stability
CLC: O631.3
Type: Master's thesis
Year: 2010
Downloads: 213
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Abstract


The design and synthesis of novel structure and excellent performance coordination polymers today coordination chemistry and crystal engineering field research one of the hot spots. In this paper, in order to build the excellent luminescence properties and the stability of the molecular skeleton of coordination polymers as research objective, selection of a transition metal ion and three mutually isomers pyridyl substituted terpyridine ligands and polycarboxylates auxiliary ligand in water reaction under thermal conditions, successful preparation of the complex of 18 different dimensions, and single crystal X-ray diffraction, the experimental techniques of X-ray powder diffraction, infrared spectroscopy, thermal gravimetric analysis, fluorescence and UV spectra of their structure and The performance characterization. The text is divided into five chapters, each chapter briefly as follows: The first chapter, a brief introduction to the basic concepts of coordination chemistry, crystal engineering and coordination polymers. An overview of the classification of the coordination polymers and synthetic methods, the the terpyridine complexes emitting research and pyridyl to replace the terpyridine class coordination polymer research progress. Chapter II synthesize three types of inter-pyridyl isomers substituted terpyridine ligand: 4'-(4 - pyridyl) -2,2 ': 6', 2 \4 - pyridyl) -3,2 ': 6', 3 \Characterization using 4'-(4 - pyridyl) -3,2 ': 6', 3 \matter 1-3. The crystal structure of the complexes 1-3 exhibit different dimensions, two-dimensional layer (1), the doublet interspersed dimensional layer (2) and the three-dimensional network (3). Preliminary study the influence of the the polycarboxylates auxiliary ligand on the polymer structure of the ligand, the results show that: the complexity of the structure of the ancillary ligand will lead to the increase in the dimension of coordination polymer. Meanwhile, the complexes 1-3 have good fluorescence properties and thermal stability properties. Chapter using 4'-(4 - pyridyl) -4,2 ': 6', 4 \new coordination polymers 4-9. complexes 4-6 is a one-dimensional chain (4), two-dimensional layer (5) and a three-dimensional network structure (6). complexes 7-9 are multi dimensional honeycomb interspersed like structure in the structure 6 complexes, both can be observed to the structural differences caused by different polycarboxylic acids auxiliary ligand, can also see the role of the different center of metal ions on the structure. complexes 4-6 all exhibit pyridyl substituted the terpyridine class ligand fluorescence, but a certain degree of enhancement in the fluorescence intensity relative to free polypyridyl ligand complexes 4-6 decomposition temperature higher than the structural body skeleton, particularly in conjunction with object 6, the decomposition temperature reached above 350 ℃ Chapter IV using maleic acid in situ ligand reaction (vinyl isomerization and hydroxylation), and 4 - pyridyl substituted terpyridine ligands and Zn2 ion build four novel structure of the ligand polymer 10-13 in complexes 10 and 11, the maleic acid is isomerized to fumaric acid. complexes 12 and 13, maleic is hydroxy acid into 2 - malic acid. preliminary discussion of the impact of maleic acid occurs in situ ligand reaction factors. fifth chapter of the use of different zinc salts and 4'-(4 - pyridyl) - 3,2 ': 6', 3 \Complex self-assembly process, the structure of the anionic complexes have an important impact. This part of the work on the further study of the structure of the anion effect of regulatory coordination polymer with a certain significance.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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