Syntheses And Properties Of Organic-inorganic Coordination Compounds Based On Semi-rigid Ligands Bridged By 1, 3, 4-Oxadiazole

The supramolecular chemistry driven by coordination interactions has recently become area of increasing interest. Self-assembly of organic ligands and inorganic metal ions is one of the most efficient and widely used approaches for the construction of organic-inorganic composite materials. Very recently, remarkable progress has been made in the area of supramolecular polymers. Many coordination compounds from zero- dimensional to three-dimensional structures have been synthesized and characterized by chemists in the world. In this thesis, a series of semirigid ligands bridged by the 1, 3, 4-oxadiazole were synthesized. The coordination chemistry based on these new ligands and metal ions was investigated. Totally, 29 new coordination compounds were prepared and fully characterized by IR, elemental analysis, and X-ray single-crystal diffraction. The luminescent properties of the coordination compounds were investigated.I. Three coordination compounds generated from the 1, 3, 4-oxadiazole bridged cyano-ligands and Ag (I) have been synthesized. The results demonstrated that the versatile coordination fashions of the semi-rigid ligands influenced the structures of resulted compounds significantly. Their luminescent properties were investigated in the solid state.II. The coordination chemistry based on 1, 3, 4-oxadiazole bridging semi-rigid imidazole and 2-pyridin-benzoimidazole ligands and transitional M (II) (M = Co,Cd,Hg,Cu and Mn) salts has been investigated in solution and hydrothermal reaction. Eleven new supramolecular compounds were synthesized based on them. The influence of the versatile coordination fashions of the semi-rigid ligands was investigated. Besides, The reason of the decomposition of 1, 3, 4-oxadiazole ring during the reaction process was discussed.III. New types of the 1, 3, 4-oxadiazole-2-thione bridged and ester terminated ligands were designed and synthesized. Coordination chemistry of these new ligands with M (II) (M = Co,Cd and Mn) and Ag (I) was investigated, and eight coordination polymers were obtained. Besides, the hydrothermal reactivity of ester terminated ligands was explored.