[ Instrument Network Instrument R & D ] Metal-organic frameworks (MOFs) have the characteristics of high crystallinity, high porosity, and adjustable structure. However, it is one of the research hotspots and difficult points in this field to build ultra-stable MOFs materials to enable them to meet certain harsh application environments.
With the support of the National Natural Science Foundation of China, the Strategic Leading Science and Technology Project of the Chinese Academy of Sciences, and the key research projects of frontier science, the research team of Cao Rong and Liu Tianfu of the State Key Laboratory of Structural Chemistry of the Fujian Institute of Research on the Structure of Matter of the Chinese Academy of Sciences designed and synthesized Two cases of MOFs with the same topological structure and the frames are electrically positive (PFC-8) and electrically neutral (PFC-9). By comparing the chemical stability of the two MOFs materials, it can be found that the electropositive framework has a mutually exclusive electrostatic effect on species of the same charge in the microenvironment, thereby significantly improving the stability of the material. Therefore, the electropositive MOFs material can maintain its skeleton integrity after being immersed in concentrated hydrochloric acid for 301 days and 86 days in aqua regia; in addition, the material can stably exist in seawater and hydrogen peroxide for at least 30 days. In view of the positive charge and intrinsic micropores of the MOFs material framework, the authors can use a simple ion exchange method to introduce PdCl42- into the framework. After that, the MOFs composite material with uniformly dispersed tiny palladium nanoparticles was obtained by reduction. The material can efficiently catalyze the decomposition of formic acid to produce hydrogen. The results were published in Angew. Chem. Int. Ed.
This work provides new ideas for the design and synthesis of stable MOFs materials, expands the application range of the materials, and provides an important reference for the development of stable materials and the versatility of materials under harsh conditions.
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