Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (2): 440-445.doi: 10.1007/s40242-022-1477-3

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

MENG Weijia1, LI Yang1, ZHAO Ziqiang1, SONG Xiaoyu1, LU Fanli1, LU Fanli1,2   

  1. 1. Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin 300072, P. R. China;
    2. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China
  • Received:2021-11-30 Revised:2022-01-11 Online:2022-04-01 Published:2022-01-07
  • Contact: CHEN Long, LU Fanli, SONG Xiaoyu E-mail:longchen@jlu.edu.cn;fanlilu@tju.edu.cn;songxiaoyu@tju.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development Program of China(No.2017YFA0207500) and the National Natural Science Foundation of China(No.51973153).

Abstract: 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 A2B2monomer, 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.

Key words: “Two-in-one” strategy, Covalent organic framework film, Molecular sieving, Pore engineering