Synthesis And Structural Control Of Actinide Complexes Based On Halogenated Organic Carboxylic Acids

With the rapid development of the global economy,the world’s energy consumption is facing unprecedented pressure.The energy crisis has become another major problem facing all countries in the world today.All countries in the world are looking for new energy sources to solve the problem of energy shortages.Solar energy,wind energy and other energy sources can only solve the energy problem in a short time.Nuclear energy is used by various countries due to its large reserves and cleanliness.However,the large amount of radioactive waste generated during the development and use of nuclear energy is also an urgent need for scientists.solved problem.Uranium is a key element in radioactive waste.Through the study of uranium’s chemical environment and coordination methods,the understanding of uranium can be increased,which can effectively guide spent fuel reprocessing and nuclear fuel recycling,thereby effectively promoting the development of nuclear energy.,Effectively alleviate the world’s energy shortage problem.In the past few decades,coordination polymers have attracted widespread attention due to their unique properties and diverse molecular structures.In recent years,there have been a lot of researches on the design,synthesis,properties and applications of its new structures,but most of them are based on the exploration of the structure of uranyl complexes,and the bonding mode of uranyl coordination polymers and the interaction between host and guest the effect is rarely studied.The purpose of this paper is to prepare functionalized uranyl organic coordination polymers with hexavalent uranyl cation as the metal center,and to study the bonding and coordination modes of uranyl ions by introducing different auxiliary ligands and auxiliary metals;Multifunctional chloroisonicotinic acid ligands are used to synthesize functionalized uranyl polymers,and study the role of halogen-halogen interactions in uranyl complexes in order to develop functional uranyl compounds with potential applications Organic complexes.The main research content and main conclusions of this paper are as follows.（1）Using 2,6-dichloroisonicotinic acid as the ligand,2,2’-bipyridine as the auxiliary ligand,adding competitive heterogeneous metal Ag⁺,Zn²⁺,Cu²⁺plasma as the auxiliary metal,through solvothermal reaction,six kinds of uranyl organic coordination polymers were prepared,and then assembled into new organic uranyl compounds by introducing heterogeneous metal elements.Finally,the structure was characterized and the mechanism of action was analyzed.The results show that the halogenated ligand has the ability to influence and control the uranyl coordination environment through halogen-halogen interactions.The carboxyl group of the isonicotinic acid ligand binds to heterogeneous metal ions,and the functionalized chlorinated isonicotinic acid passes through the halogen halogen.,Hydrogen bond orπ-πinteraction,enhance the binding force between the complex molecules.（2）Using 2,6-dichloroisonicotinic acid as the ligand,4,4’-bipyridine-1,1-dioxide as the auxiliary ligand,in 1mol/L Na OH solution,and uranyl through solvothermal The uranyl organic material with thermomechanical response was synthesized by reaction,and the uranyl organic material was subjected to temperature-variable single crystal X-ray diffraction,cyclic temperature-variable single-crystal X-ray diffraction,temperature-variable powder X-ray diffraction and differential thermal scanning calorimetry.analysis.The results show that the uranyl organic material exhibits anisotropy to temperature when heated;through in-situ high-temperature hot-bed tests,the thermally induced jump phenomenon of the compound was observed,and it was verified by single crystal X-ray diffraction.The preparation of the uranyl organic coordination polymer provides a certain reference value for the development of flexible materials.