Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585.
College of Environment and Ecology, Chongqing University, Chongqing 400045, China.
J Am Chem Soc. 2022 Aug 24;144(33):14992-14996. doi: 10.1021/jacs.2c05309. Epub 2022 Aug 5.
Rational design of covalent organic frameworks (COFs) to broaden their diversity is highly desirable but challenging due to the limited, expensive, and complex building blocks, especially compared with other easily available porous materials. In this work, we fabricated two novel bioinspired COFs, namely, NUS-71 and NUS-72, using reticular chemistry with ellagic acid and triboronic acid-based building blocks. Both COFs with AB stacking mode exhibit high acetylene (CH) adsorption capacity and excellent separation performance for CH/CO mixtures, which is significant but rarely explored using COFs. The impressive affinities for CH appear to be related to the sandwich structure formed by CH and the host framework via multiple host-guest interactions. This work not only represents a new avenue for the construction of low-cost COFs but also expands the variety of the COF family using natural biochemicals as building blocks for broad application.
合理设计共价有机框架（COFs）以拓宽其多样性是非常理想的，但由于有限、昂贵且复杂的构建块，这极具挑战性，尤其是与其他容易获得的多孔材料相比。在这项工作中，我们使用基于鞣酸和三硼酸的构建块，通过网状化学方法制造了两种新型仿生 COFs，即 NUS-71 和 NUS-72。这两种 COFs 均采用 AB 堆积模式，表现出高乙炔（CH）吸附能力和对 CH/CO 混合物的优异分离性能，这在使用 COFs 时意义重大但很少被探索。CH 表现出令人印象深刻的亲和力似乎与 CH 和主体骨架通过多个主客体相互作用形成的三明治结构有关。这项工作不仅为构建低成本 COFs 开辟了新途径，而且还使用天然生物化学物质作为构建块扩展了 COF 家族的多样性，以实现广泛应用。
