Creating amphiphilic porosity in two-dimensional covalent organic frameworks via steric-hindrance-mediated precision hydrophilic-hydrophobic microphase separation

Shu-Yan Jiang, Zhi-Bei Zhou, Shi-Xian Gan, Ya Lu, Chao Liu, Qiao-Yan Qi, Jin Yao () and Xin Zhao ()
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Shu-Yan Jiang: Chinese Academy of Sciences
Zhi-Bei Zhou: Chinese Academy of Sciences
Shi-Xian Gan: Chinese Academy of Sciences
Ya Lu: Chinese Academy of Sciences
Chao Liu: Chinese Academy of Sciences
Qiao-Yan Qi: Chinese Academy of Sciences
Jin Yao: Chinese Academy of Sciences
Xin Zhao: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Creating different pore environments within a covalent organic framework (COF) will lead to useful multicompartment structure and multiple functions, which however has been scarcely achieved. Herein we report designed synthesis of three two-dimensional COFs with amphiphilic porosity by steric-hindrance-mediated precision hydrophilic-hydrophobic microphase separation. Dictated by the different steric effect of the substituents introduced to a monomer, dual-pore COFs with kgm net, in which all hydroxyls locate in trigonal micropores while hydrophobic sidechains exclusively distribute in hexagonal mesopores, have been constructed to form completely separated hydrophilic and hydrophobic nanochannels. The unique amphiphilic channels in the COFs enable the formation of Janus membranes via interface growth. This work has realized the creation of two types of channels with opposite properties in one COF, demonstrating the feasibility of introducing different properties/functions into different pores of heteropore COFs, which can be a useful strategy to develop multifunctional materials.

Date: 2024
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DOI: 10.1038/s41467-024-44890-3

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