title: Ionic Covalent Organic Frameworks: Design of a Charged Interface Aligned on 1D Channel Walls and Its Unusual Electrostatic Functions.
abstract: 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 CO2is 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.
authors.affiliation: Field of Energy and Environment, School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, 923-1292, Japan.
authors.forename: Ning
authors.initials: N
authors.lastname: Huang
authors.affiliation: Field of Energy and Environment, School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, 923-1292, Japan.|Department of Structural Molecular Science, School of Physical Science, SOKENDAI, Hayama, 240-0193, Kanagawa, Japan.
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.affiliation: Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstrasse 2, 04103, Leipzig, Germany.
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Addicoat
authors.affiliation: Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstrasse 2, 04103, Leipzig, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Heine
authors.affiliation: Field of Energy and Environment, School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, 923-1292, Japan.
authors.forename: Donglin
authors.identifier: 0000-0002-3785-1330
authors.initials: D
authors.lastname: Jiang
keywords: anionic pollutants; carbon dioxide; covalent organic frameworks; ionic interfaces; porous materials