Postsynthetic Transformation of Imine- into Nitrone-Linked Covalent Organic Frameworks for Atmospheric Water Harvesting at Decreased Humidity
Journal of the American Chemical Society2023Vol. 145(24), pp. 13241–13248
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Lars Grunenberg, Gökçen Savaşçı, Sebastian T. Emmerling, Fabian Heck, Sebastian Bette, Afonso Cima Bergesch, Christian Ochsenfeld, Bettina V. Lotsch
Abstract
Herein, we report a facile postsynthetic linkage conversion method giving 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-modified pore channels induce condensation of water vapor at 20% lower humidity compared to their amine- or imine-linked precursor COFs. Thus, the topochemical transformation to nitrone linkages constitutes an attractive approach to postsynthetically fine-tune water adsorption properties in framework materials.
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