Investigation Of Construction And Properties Of Coordination Polymers Based On Multi-carboxylatic Acid And N Ligands

With the research priority being changed from synthesis, structure characterizations to unique functional properties, the research of coordination functional material is mainly focusing on two aspects:investigation of the structure-property relationship and exploration of advanced composite material with more superior properties. In other words, employment of related principle in molecular designing and crystal engineering is used to modify and assemble the coordination polymers by molecular-cutting and molecular-assembling through the method adjusting effective influence elements, which will become the tendency in coordination chemistry. Most importantly, the selection of the organic ligand and metal ions is needed. As structure determines property, it is hard to design and control the structural peculiarity of flexible ligand. Because of its high freedom and multi-coordinate point, generating some peculiar functional properties will become a new research hotspot in coordination chemistry.In this thesis, we have prepared some new coordination polymers on the basis of different flexible and rigid carboxylic ligands and transition metal, and characterized the properties of the complexes, such as single X-ray diffraction analysis, thermal analysis-differential scanning calorimetry(TG-DSC), infrared spectra(IR), power X-ray diffraction analysis(PXRD) and magnetic susceptibility measurements; and we there also been discussed the synthetic conditions and rules for the compounds; and explored the relationships between structures and properties for the sets of compounds. The thesis includes four chapters.Chapter1discusses the definition, development, classification and potential functions of coordination compounds, especially the study of the synthesized methods, the characteristics of types of multi-carboxylic compounds and their peculiar functional properties, as well as the conclusion of the novel topology structure compounds. The aim and progress of the related research have been outlined.In chapter2, by mixing a typical flexible carboxylic ligand (H4btc acid) and multi-pyridyl ligands in the presence of transition metal ions, four coordination polymers have been synthesized, which have kinds of dimensions, topological structures and functional properties. And compounds4have the high porosity which presents the potential adsorption materials. In chapter3, a compound has been prepared by mixing flexible fluorouscarboxylic acid and rigid ligands in the presence of transition metal ions, which exhibits three-dimensional structural frameworks. It has been demonstrated that how the coordinated modes of ligands of fluorouscarboxylic acid and the reaction condition influence the structure and properties of the coordination polymers. Besides, the compound5is reported, bridged dicobalt(II) with unique topology structure and strong antimagnetic behavior, which has been theoretically calculated and simulated for its magnetism.Chapter4reports the rigid phenylcarboxylic acid ligand compound,which mixed with transition metal ions compound. Because of the π-π stacting effect between the ligands, both compounds exhibit three-dimensional supermolecular structural frameworks.As a conclusion, the research work of this thesis enriches and development of the coordination chemistry and functional materials science, and also provides the new methods and experiment basis to design and construct functional coordination polymers. Therefore, this research work will have a good application and scientific values in the future.