磁性稀土金属-有机骨架分子材料的动态调控及多功能化研究

项目名称： 磁性稀土金属-有机骨架分子材料的动态调控及多功能化研究

项目编号： No.21471154

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 刘彩明

作者单位： 中国科学院化学研究所

项目金额： 90万元

中文摘要： 设计合成一系列多羧酸类有机间隔配体，用它们和辅助配体一起跟Dy(III)、Tb(III)等磁各向异性大的稀土金属离子构筑成稀土金属-有机骨架分子材料，使稀土金属离子具有较高对称性的配位构型，有利于呈现出单分子磁体性质。同时利用金属-有机骨架分子材料的微孔中溶剂分子的脱附和吸附作用引起稀土金属离子配位构型的微小变化，从而带来配位场的变化来调控其单分子磁体性质，实现其磁性的可逆动态调控；在此基础上,进一步通过引入手性配体等策略来使稀土金属-有机骨架分子材料结晶于极性点群，还能使其同时具备铁电性质和单分子磁体性质，实现多功能化，得到多铁性分子材料，并进而研究用脱附和吸附作用来动态调控其多铁性质。深入研究本课题，不但能获得一系列新型客体分子剌激响应型稀土金属-有机骨架功能分子材料，找到合成多功能分子基材料的新途径和规律，而且可以丰富稀土配位化学、结构化学、磁化学、固相材料化学等相关学科的内容。

中文关键词： 单分子磁体；铁电性；金属-有机骨架分子材料；刺激-响应性材料；多铁性

英文摘要： A series of linker-bridging organic ligands with polycarboxylic groups will be designed and synthesized, which are then treated with the lanthanide metal ions containing large magnetic anisotropy such as Dy(III) and Tb(III), along with auxiliary ligands to construct lanthanide-organic framework materials. So that the lanthanide metal ions possess high symmetric coordination geometries, being propitious to show single-molecule magnet properties. Moreover, the desorption and adsorption of solvent molecules of the porous metal-organic framework materials generally cause the slight change in the coordination configuration of the lanthanide metal ions, which can lead to changes in the ligand field correspondingly, achieving the dynamic control of single-molecule magnet properties reversibly. Furthermore, introducing chiral ligands and other strategies will be applied to make the lanthanide-organic framework materials crystallize in polar point groups. Both the ferroelectric property and the single-molecule magnet property maybe coexist consequently, realizing multifunction, and multiferroic molecular materials will be obtained, whose properties possibly can be dynamically regulated by the desorption and adsorption of solvent molecules too. After systematic study of the subject, a series of novel stimuli-responsive lanthanide-organic framework materials will be obtained, and new ways and laws of the synthesis of multifunctional molecule-based materials will be discovered. The research also may accelerate the development of many correlative subjects such as lanthanide coordination chemistry, structral chemistry, molecule magnetism and solid state materials.

英文关键词： single-molecule magnet;ferroelectric properties;metal-organic framework materials;stimuli-responsive materials;multiferroic properties