Hydrogen-bonding and π-π interaction promoted solution-processable covalent organic frameworks

Lei Zhang, Qiu-Hong Zhu, Yue-Ru Zhou, Shuang-Long Wang, Jie Fu, Jia-Ying Liu, Guo-Hao Zhang, Lijian Ma, Guohua Tao (), Guo-Hong Tao () and Ling He ()
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Lei Zhang: Sichuan University
Qiu-Hong Zhu: Sichuan University
Yue-Ru Zhou: Sichuan University
Shuang-Long Wang: Sichuan University
Jie Fu: Sichuan University
Jia-Ying Liu: Sichuan University
Guo-Hao Zhang: Sichuan University
Lijian Ma: Sichuan University
Guohua Tao: Peking University Shenzhen Graduate School
Guo-Hong Tao: Sichuan University
Ling He: Sichuan University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Covalent organic frameworks show great potential in gas adsorption/separation, biomedicine, device, sensing, and printing arenas. However, covalent organic frameworks are generally not dispersible in common solvents resulting in the poor processability, which severely obstruct their application in practice. In this study, we develop a convenient top-down process for fabricating solution-processable covalent organic frameworks by introducing intermolecular hydrogen bonding and π-π interactions from ionic liquids. The bulk powders of imine-linked, azine-linked, and β-ketoenamine linked covalent organic frameworks can be dispersed homogeneously in optimal ionic liquid 1-methyl-3-octylimidazolium bromide after heat treatment. The resulting high-concentration colloids are utilized to create the covalent organic framework inks that can be directly printed onto the surface. Molecular dynamics simulations and the quantum mechanical calculations suggest that C‒H···π and π-π interaction between ionic liquid cations and covalent organic frameworks may promote the formation of colloidal solution. These findings offer a roadmap for preparing solution-processable covalent organic frameworks, enabling their practical applications.

Date: 2023
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DOI: 10.1038/s41467-023-43905-9

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