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 (C₂H₂) adsorption capacity and excellent separation performance for C₂H₂/CO₂ mixtures, which is significant but rarely explored using COFs. The impressive affinities for C₂H₂ appear to be related to the sandwich structure formed by C₂H₂ 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.

中文翻译：

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仿生共价有机框架中乙炔在 CO2 上的高效吸附

合理设计共价有机框架 (COF) 以扩大其多样性是非常可取的，但由于构建块有限、昂贵且复杂，特别是与其他容易获得的多孔材料相比具有挑战性。在这项工作中，我们使用基于鞣花酸和三硼酸的结构单元的网状化学制造了两种新型的仿生 COF，即 NUS-71 和 NUS-72。两种具有 AB 堆叠模式的 COF 都表现出较高的乙炔 (C ₂ H _{2 ) 吸附能力和对 C 2} H ₂ /CO ₂混合物的出色分离性能，这很重要，但很少使用 COF 进行探索。_{C 2} H ₂令人印象深刻的亲和力似乎与由 C ₂ H ₂和主体框架通过多个主客体相互作用形成的夹层结构有关。这项工作不仅代表了构建低成本 COF 的新途径，而且还扩展了 COF 家族的多样性，使用天然生化物质作为广泛应用的基石。