Ionic Covalent Organic Frameworks: Design of a Charged Interface Aligned on 1D Channel Walls and Its Unusual Electrostatic Functions
Ionic Covalent Organic Frameworks: Design of a Charged Interface Aligned on 1D Channel Walls and Its Unusual Electrostatic Functions
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DOI：
10.1002/anie.201611542
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发表时间：
2017-04-24
影响因子：
16.6
通讯作者：
Jiang, Donglin
中科院分区：
文献类型：
--
作者：
Huang, Ning;Wang, Ping;Jiang, Donglin
共价有机框架（COFs）已成为设计层状二维聚合物的定制平台。然而，它们大多以中性多孔材料的形式获得。在这里，我们报告了具有正电荷壁的离子晶体多孔COFs的构建，这使得能够创建良好排列但空间受限的离子界面。非常规的反向aa堆叠模式交替地将阳离子中心定向到壁的两侧；离子界面赋予COFs不同寻常的静电功能。因为所有的墙壁都用电偶极子装饰，与中性模拟物相比，二氧化碳的吸收量增加了三倍。由于阳离子之间有足够的开放空间，离子界面在离子交换中表现出优异的可及性、效率和选择性，以捕获阴离子污染物。这些发现表明，离子界面的构建为COFs的结构和功能设计提供了一条新的途径。
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.