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Isostructural Three‐Dimensional Covalent Organic Frameworks
Author(s) -
Gao Chao,
Li Jian,
Yin Sheng,
Lin Guiqing,
Ma Tianqiong,
Meng Yi,
Sun Junliang,
Wang Cheng
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201905591
Subject(s) - isostructural , crystallinity , crystallite , covalent bond , materials science , topology (electrical circuits) , hydrogen bond , crystallography , nanotechnology , crystal structure , chemistry , molecule , organic chemistry , mathematics , combinatorics
Herein, we reported the designed synthesis of three isostructural three‐dimensional covalent organic frameworks (3D COFs) with ‐H, ‐Me, or ‐F substituents, which have similar crystallinity and topology. Their crystal structures were determined by continuous rotation electron diffraction (cRED), and all three 3D COFs were found to adopt a fivefold interpenetrated pts topology. More importantly, the resolution of these cRED datasets reached up to 0.9–1.0 Å, enabling the localization of all non‐hydrogen atomic positions in a COF framework directly by 3D ED techniques for the first time. In addition, the precise control of the pore environments through the use of different functional groups led to different selectivities for CO 2 over N 2 . We have thus confirmed that polycrystalline COFs can be definitely studied to the atomic level as other materials, and this study should also inspire the design and synthesis of 3D COFs with tailored pore environments for interesting applications.