A pillar[5]arene-based covalent organic framework with pre-encoded selective host–guest recognition |
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Authors: | Lu Liu Yiming Hu Shaofeng Huang Yinghua Jin Jingnan Cui Weitao Gong Wei Zhang |
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Institution: | State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024 P. R. China.; Engineering Laboratory of Boric and Magnesic Functional Material Preparative and Applied Technology, Dalian Liaoning Province 116024 P. R. China ; Department of Chemistry, University of Colorado Boulder, Boulder Colorado 80309 USA, |
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Abstract: | It is highly desirable to maintain both permanent accessible pores and selective molecular recognition capability of macrocyclic cavitands in the solid state. Integration of well-defined discrete macrocyclic hosts into ordered porous polymeric frameworks (e.g., covalent organic frameworks, COFs) represents a promising strategy to transform many supramolecular chemistry concepts and principles well established in the solution phase into the solid state, which can enable a broad range of practical applications, such as high-efficiency molecular separation, heterogeneous catalysis, and pollution remediation. However, it is still a challenging task to construct macrocycle-embedded COFs. In this work, a novel pillar5]arene-derived (P5) hetero-porous COF, denoted as P5-COF, was rationally designed and synthesized. Featuring the unique backbone structure, P5-COF exhibited selective adsorption of C2H2 over C2H4 and C2H6, as well as significantly enhanced host–guest binding interaction with paraquat, in comparison with the pillar5]arene-free COF analog, Model-COF. The present work established a new strategy for developing COFs with customizable molecular recognition/separation properties through the bottom-up “pre-porous macrocycle to porous framework” design.A novel pillar5]arene-derived (P5) COF was rationally designed and synthesized, which exhibited superior performance in selective gas adsorption and paraquat binding. |
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