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    Ultrathin 2D Covalent Organic Framework Film Fabricated via Langmuir-Blodgett Method with a Two-in-One Type Monomer

    Year: 2022

    Journal: Chem. Res. Chin. Univ., Volume 38, APR, page 440–445

    Authors: Meng Weijia; Li Yang; Zhao Ziqiang; Song Xiaoyu; Lu Fanli; Chen Long

    Organizations: National Key Research and Development Program of China [2017YFA0207500]; National Natural Science Foundation of China [51973153]

    Keywords: Two-in-one strategy; Covalent organic framework film; Molecular sieving; Pore engineering

    In recent years, covalent organic frameworks(COFs) are evolving as a novel kind of porous materials for catalysis and molecular separation, gas adsorption, etc. Various functional building blocks have been explored to tune the pore channels, including the pore size and structures. In this article, a new terphenyl(TP) based COF(TP-COF) was developed via a two-in-one strategy by using a symmetric A(2)B(2) monomer, i.e., 4,4 ''-diamino-2 ',5 '-diformyl-1,1 ':4 ',1 ''-terphenyl(DADFTP). The pore size of TP-COF was only 0.99 nm by shortening the arm length of the DADFTP monomer. Freestanding, continuous and ultrathin COF films could be facilely prepared at the air-liquid interface through the modified Langmuir-Blodgett(LB) method. TP-COF films exhibited high rejection of over 90% for dyes removal.
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