Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 18, Pages 4982-4986Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201611542
Keywords
anionic pollutants; carbon dioxide; covalent organic frameworks; ionic interfaces; porous materials
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Funding
- ENEOS Hydrogen Trust Fund
- Grants-in-Aid for Scientific Research [17H01218] Funding Source: KAKEN
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Covalent organic frameworks (COFs) have emerged as a tailor-made platform for designing layered two-dimensional polymers. However, most of them are obtained as neutral porous materials. Here, we report the construction of ionic crystalline porous COFs with positively charged walls that enable the creation of well aligned yet spatially confined ionic interface. The unconventional reversed AA-stacking mode alternately orientates the cationic centers to both sides of the walls; the ionic interface endows COFs with unusual electrostatic functions. Because all of the walls are decorated with electric dipoles, the uptake of CO2 is enhanced by three fold compared to the neutral analog. By virtue of sufficient open space between cations, the ionic interface exhibits exceptional accessibility, efficiency, and selectivity in ion exchange to trap anionic pollutants. These findings suggest that construction of the ionic interface of COFs offers a new way to structural and functional designs.
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