Toward azo-linked covalent organic frameworks by developing linkage chemistry via linker exchange

Zhi-Bei Zhou, Peng-Ju Tian, Jin Yao, Ya Lu, Qiao-Yan Qi and Xin Zhao ()
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Zhi-Bei Zhou: Chinese Academy of Sciences
Peng-Ju Tian: Chinese Academy of Sciences
Jin Yao: Chinese Academy of Sciences
Ya Lu: Chinese Academy of Sciences
Qiao-Yan Qi: Chinese Academy of Sciences
Xin Zhao: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Exploring new linkage chemistry for covalent organic frameworks (COFs) provides a strong driving force to promote the development of this emerging class of crystalline porous organic materials. Herein we report a strategy to synthesize COFs with azo linkage, one of the most important functional unit in materials science but having not yet been exploited as a linkage of COFs. This strategy is developed on the basis of in situ linker exchange, by which imine-linked COFs are completely transformed into azo-linked COFs (Azo-COFs). Moreover, distinct properties of Azo-COFs from their corresponding imine-linked precursors are observed, indicating unique property of Azo-COFs. This strategy provides a useful approach to develop new linkage chemistry for COFs. It also has established a synthetic method for azo-linked COFs, which not only enriches the family of COFs but also offers a platform to explore properties and applications of this class of crystalline porous conjugated polymers.

Date: 2022
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DOI: 10.1038/s41467-022-29814-3

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