文献类型：期刊文献

英文题名：Construction of Covalent Organic Frameworks with Crown Ether Struts

作者：An, Shuhao[1];Xu, Qing[2];Ni, Zhihui[3];Hu, Jun[1];Peng, Changjun[1];Zhai, Lipeng[3];Guo, Yu[2];Liu, Honglai[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Adv Res Inst SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China;[3]Zhongyuan Univ Technol, Henan Key Lab Funct Salt Mat, Ctr Adv Mat Res, Zhengzhou 45007, Peoples R China

年份：2021

卷号：60

期号：18

起止页码：9959

外文期刊名：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录：;EI(收录号：20211310135703);WOS:【SCI-EXPANDED(收录号:WOS:000629781900001)】；

基金：Thanks to the financial supports of the Natural Science Foundation of China (Nos. 91834301 and 22008064). Q. Xu acknowledges the financial support from Shanghai Pujiang Program (19PJ1410400) and the Natural Science Foundation of Shanghai (20ZR1464000). L. Zhai appreciates support from Key Projects of Science and Technology of Henan Province (No. 212102210208) and Zhongyuan University of Technology start-up grant.

语种：英文

外文关键词：alkali metal ion separation; covalent organic frameworks; crown ether; porous materials

摘要：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.