Abstract Covalent organic frameworks (COFs), with two dimensional (2D-) or three dimensional (3D-) structures, have accessible open channels or nanopores, with uniform sizes ranging from angstroms to nanometers and have emerged as an excellent and promising platform for designing catalysts or catalyst carriers. Herein, a 2D-COF grafted with a 1-alkyl-3-methylimidazolium-based ionic liquid (AMIMBr@H2P-DHPh COF) on the channel walls was synthesized and utilized as a highly efficient heterogeneous catalyst for the chemical fixation of CO2 via a reaction with epoxides under solvent-free and co-catalyst-free conditions. The as-synthesized AMIMBr@H2P-DHPh COF shows excellent catalytic activity in promoting the cycloaddition reactions between epoxide and CO2; the excellent catalytic activity was maintained for up to five cycles. Advantages like high porosity, functional versatility, easy modification of COFs, and high catalytic activity of ionic liquids, have been realized in a single material.

中文翻译：

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用于催化环氧化物和二氧化碳之间环加成反应的共价有机骨架的电离

摘要 具有二维 (2D-) 或三维 (3D-) 结构的共价有机框架 (COFs) 具有可接近的开放通道或纳米孔，尺寸从埃到纳米不等，已成为一种优秀且有前途的设计平台。催化剂或催化剂载体。在此，合成了在通道壁上接枝了 1-烷基-3-甲基咪唑鎓基离子液体（AMIMBr@H2P-DHPh COF）的 2D-COF，并将其用作高效的多相催化剂，通过在无溶剂和无助催化剂的条件下与环氧化物反应。合成的AMIMBr@H2P-DHPh COF在促进环氧化物和CO2之间的环加成反应方面表现出优异的催化活性；优异的催化活性可保持长达五个循环。