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Construction of Covalent Organic Frameworks with Crown Ether Struts
Author(s) -
An Shuhao,
Xu Qing,
Ni Zhihui,
Hu Jun,
Peng Changjun,
Zhai Lipeng,
Guo Yu,
Liu Honglai
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202101163
Subject(s) - crown ether , crystallinity , covalent bond , alkali metal , chemistry , molecule , crown (dentistry) , polymer chemistry , materials science , organic chemistry , ion , crystallography , composite material
Crown ethers are a class of macrocyclic molecules with unique flexible structures but they are rarely integrated in covalent organic frameworks (COFs). To date, employing flexible organic units such as crown ethers to construct COFs with high crystallinity and surface area are still a challenge. In this work, two new COFs with different flexible crown ethers as backbone rather than side chains are synthesized and further employed for alkali metal ions separation. Both of COFs possess high surface areas, good crystallinity, and excellent chemical stability. Interestingly, these two new COFs with 18‐crown‐6 or 24‐crown‐8 units showed remarkable binding ability of K + or Cs + owing to the size‐fit effect. This work demonstrated that the unique structural features of crown ethers will lead to increase interest in fabricating COFs with crown ethers.