A pillar[5]arene-based covalent organic framework with pre-encoded selective host–guest recognition† † Electronic supplementary information (ESI) available: 1H NMR, 13C NMR, and IR spectra, solid-state NMR spectrum, SEM images, TGA curve, PXRD patterns and nitrogen adsorption isotherms. See DOI: 10.1039/d1sc03680g

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 pillar[5]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 pillar[5]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 pillar[5]arene-derived (P5) COF was rationally designed and synthesized, which exhibited superior performance in selective gas adsorption and paraquat binding.

SUBMITTER: Liu L 

PROVIDER: S-EPMC8528016 | biostudies-literature |

REPOSITORIES: biostudies-literature