Reversible shape memory two-dimensional covalent organic frameworks

Mingchao Shao, Jinyang Chen, Wenqiang Gao, Qingsong Zhang, Xiaofang Wei, Junhua Kuang, Guocai Liu, Yang Sun, Yangshuang Bian, Chengyu Wang, Mingcong Qin, Xueli Yang, Jichen Dong (), Yunqi Liu and Yunlong Guo ()
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Mingchao Shao: Chinese Academy of Sciences
Jinyang Chen: Chinese Academy of Sciences
Wenqiang Gao: Chinese Academy of Sciences
Qingsong Zhang: Chinese Academy of Sciences
Xiaofang Wei: Chinese Academy of Sciences
Junhua Kuang: Chinese Academy of Sciences
Guocai Liu: Chinese Academy of Sciences
Yang Sun: Chinese Academy of Sciences
Yangshuang Bian: Chinese Academy of Sciences
Chengyu Wang: Chinese Academy of Sciences
Mingcong Qin: Chinese Academy of Sciences
Xueli Yang: Chinese Academy of Sciences
Jichen Dong: Chinese Academy of Sciences
Yunqi Liu: Chinese Academy of Sciences
Yunlong Guo: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Two-dimensional covalent organic frameworks are a unique type of organic crystals with both weak layer-layer interaction and regular one-dimensional nanochannels. Therefore, it is possible to synthesize two-dimensional covalent organic frameworks with reversible stacking phases and thus pore sizes, which hold great potential applications in future nanoelectronics, nanoreactors, intelligent response, gas separation and storage. However, such a goal remains challenging up to now, because the slipped AA-stacking is the most thermodynamically stable phase. Here, we report the realization of shape memory two-dimensional covalent organic frameworks with reversible interlayer stacking sequences, of which AA and inclined phases are induced by the formation of hot ice and the strongly adsorbed organic molecules like Tetrahydrofuran inside the two-dimensional covalent organic frameworks confined nanochannels, respectively. Based on the reversible pore sizes and pore environments, we demonstrate the feasibility of the shape memory two-dimensional covalent organic frameworks in dynamically tunable permeability and intelligent response.

Date: 2025
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DOI: 10.1038/s41467-025-64077-8

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