Uranium (VI), Thorium (IV) Complexes Synthesis, Structure And Properties

Solid-state chemistry of the actinides has become an important research subject because of its great significance to the nuclear waste disposal, power generation, mineralogy, and catalysis. The study of actinides complex helps to find out the special physical-chemical properties of nuclear fuel stored in natural geological environment and reuse the nuclear waste. Nowadays, as the increasing scarcity of energy has become extremely urgent, great emphases are being put on the actinides complex material owing to their fine photocatalytic and fluorescence properties.This dissertation mainly focuses on the synthesis of UO₂²⁺ and Th⁴⁺ complexes and research on the diversity of actinide coordination polymer. Meanwhile, the author makes further study on the exploration of their potential properties. The progress we have made as follows:1. Reaction of tris (2-carboxyethyl) isocyanurate with uranium oxynitrate hexahydrate and thorium nitrate tetrahydrate in hydrothermal conditions yields two novel compounds. The structures of these two compounds are determined by X-ray single crystal diffraction technology, and measured by IR, solid-state fluorescence, TG-DSC. It's shown that these two compounds are representative actinide ones.2. Uranium oxynitrate hexahydrate and thorium nitrate react respectively with pyridine(or pyrizine)-2,3-dicarboxylic acid, which have diversified structure, numerous coordination atom and powerful coordinate ability. A series of actinide compounds are obtained and their IR, UV and solid-state fluorescence properties are also measured. Some complexes are determined by X-ray single crystal diffraction and TG-DSC.3. Under hydrothermal conditions, 4-hydroxy-1-oxo-1,2-dihydrophthalazine-6,7-dicarboxylic acid dihydrate is systhesized by 1,2,4,5-pyromellitic acid, hydrazine hydrate and cobalt chloride, the crystal structure is determined by X-ray single crystal diffraction. Reaction of this ligand with uranium oxynitrate hexahydrate and thorium nitrate tetrahydrate, yields two compounds. The two compounds are characterized by IR, UV and solid-state fluorescence.