4.8 Article

Postsynthetic Transformation of Imine- into Nitrone-Linked Covalent Organic Frameworks for Atmospheric Water Harvesting at Decreased Humidity

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 145, Issue 24, Pages 13241-13248

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jacs.3c02572

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We present a facile method for synthesizing nitrone-linked covalent organic frameworks (COFs) from imine- and amine-linked COFs. The resulting nitrone-linked COFs exhibit high crystallinity, large surface areas, and improved water adsorption properties compared to their imine- or amine-linked precursors.
Herein, we reporta facile postsynthetic linkage conversionmethodgiving synthetic access to nitrone-linked covalent organic frameworks(COFs) from imine- and amine-linked COFs. The new two-dimensional(2D) nitrone-linked covalent organic frameworks, NO-PI-3-COF and NO-TTI-COF,are obtained with high crystallinity and large surface areas. Nitrone-modifiedpore channels induce condensation of water vapor at 20% lower humiditycompared to their amine- or imine-linked precursor COFs. Thus, thetopochemical transformation to nitrone linkages constitutes an attractiveapproach to postsynthetically fine-tune water adsorption propertiesin framework materials.

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