Recently, Associate Professor Liu Bo from the College of Chemistry and Pharmacy at Northwest A&F University proposed a new concept of crystalline porous organic frameworks based on dynamic B-O, B←N, and hydrogen bonding assembly. This provides important theoretical basis for the efficient preparation and practical application of processable and recyclable porous framework materials. The research findings were published in Angewandte Chemie International Edition.
Building upon the analysis of the structural characteristics of existing crystalline porous frameworks, the author introduced a new concept of crystalline porous organic frameworks based on dynamic B-O, B←N, and hydrogen bonding assembly. Boronic acid-based organic molecules undergo in-situ condensation to form units based on B3O3. These units further extend into molecular complexes or chain structures via B←N bonds, serving as the basic building blocks for assembly. These blocks are then interconnected through hydrogen bonding to form porous organic frameworks. Based on this assembly strategy, a series of porous frameworks were synthesized and named CPOFs. These frameworks exhibit outstanding solution processability, allowing them to dissolve and subsequently recrystallize into their original structures, a process unaffected by recrystallization conditions, possibly due to the diverse bond energies involved. Notably, CPOFs can be synthesized on a kilogram scale using economically efficient monomers. Furthermore, the numerous acidic sites impart high ammonia adsorption capacity to CPOFs, surpassing that of most porous organic materials and commercial materials.
Related paper information: https://doi.org/10.1002/anie.202405027
