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Hydrogen-bonded organic frameworks (HOF) have the advantages of easy regeneration, mild synthesis conditions, low cost, and so on, so that they have broad application prospects in the fields of gas storage and separation. However, HOF materials constructed mainly by hydrogen bonds and supramolecular weak effects such as π···π stacking have poor stability, which seriously restricts the application and development of HOF materials.
Under the support of the National Natural Science Foundation of China, the "973" Program of the Ministry of Science and Technology, the China National Academy of Sciences' Strategic Priority Pilot Science and Technology Program (B), and the Youth Innovation Promotion Association of the Chinese Academy of Sciences, the State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Materials, Chinese Academy of Sciences The research group and Yuan Daqiang's research group independently designed and synthesized an example of a porous, diamond topological five-fold interpenetrating HOF material (HOF-TCBP), which has a high specific surface area, excellent water, thermal stability, and easy reproducibility. . The results showed that when activated at 70 oC, its BET is as high as 2066 m2 g-1, which is higher than the BET value of most HOFs materials. After immersing the sample in water for 24 h, its BET only decreased to 1876 m2 g-1. However, after the sample was vacuum activated at 180 oC for 2 hours, the BET only decreased by 7.8%. After the vacuum activation at 190 oC for 2 hours, the BET decreased by 18%. The above results confirm that it has an extremely high thermal stability. However, after the vacuum activation at 190 oC for 2 hours, the sample was dissolved in a small amount of DMF, and the corresponding recycled material was quickly obtained by rotary evaporation. After the activation treatment, its BET almost returned to its initial value (2052 m2 g-1), indicating that the material is easy to regenerate. In addition, HOF-TCBP material has a good adsorption and separation effect on low-carbon hydrocarbon gases. In the field of HOF materials, this kind of material with many excellent properties is very rare. The above research results are published online in “German Applied Chemistry†(Angew. Chem. Int. Ed. 2017, 56, 2101−2104). This work will surely play a good role in the design and synthesis of stable porous HOF materials.
In addition, the research team has made great progress in porous frame materials with multiple stimulus response properties and porous frame materials with high acetylene storage capacity (Angew. Chem. Int. Ed. 2016, 55, 7478; Nat. Commun. 2015, 6, 7575; Chem. Sci, 2015, 6, 3466.). The above research results broaden the field of performance of porous framework materials.
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