Topological Isomerism in Three-Dimensional Covalent Organic Frameworks

作者：Yaozu Liu, Jingwei Li, Jia Lv, Zitao Wang, Jinquan Suo, Junxia Ren, Jianchuan Liu, Dong Liu, Yujie Wang, Valentin Valtchev, Shilun Qiu, Daliang Zhang, Qianrong Fang · 发表于：Journal of the American Chemical Society · 年份：2023 · DOI：10.1021/jacs.3c01070 · 被引用次数：131 · 研究领域：Covalent Organic Framework Applications、Metal-Organic Frameworks: Synthesis and Applications、Luminescence and Fluorescent Materials

Although isomerism is a typical and significant phenomenon in organic chemistry, it is rarely found in covalent organic framework (COF) materials. Herein, for the first time, we report a controllable synthesis of topological isomers in three-dimensional COFs via a distinctive tetrahedral building unit under different solvents. Based on this strategy, both isomers with a dia or qtz net (termed JUC-620 and JUC-621) have been obtained, and their structures are determined by combining powder X-ray diffraction and transmission electron microscopy. Remarkably, these architectures show a distinct difference in their porous features; for example, JUC-621 with a qtz net exhibits permanent mesopores (up to ∼23 Å) and high surface area (∼2060 m 2 g –1 ), which far surpasses those of JUC-620 with a dia net (pore size of ∼12 Å and surface area of 980 m 2 g –1 ). Furthermore, mesoporous JUC-621 can remove dye molecules efficiently and achieves excellent iodine adsorption (up to 6.7 g g –1 ), which is 2.3 times that of microporous JUC-620 (∼2.9 g g –1 ). This work thus provides a new way for constructing COF isomers and promotes structural diversity and promising applications of COF materials.