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Observation of Interpenetration Isomerism in Covalent Organic Frameworks.

Authors
  • Ma, Tianqiong1, 2
  • Li, Jian2
  • Niu, Jing1
  • Zhang, Lei2
  • Etman, Ahmed S3
  • Lin, Cong2
  • Shi, Dier2
  • Chen, Pohua2
  • Li, Li-Hua1
  • Du, Xin2
  • Sun, Junliang2, 3
  • Wang, Wei1, 4
  • 1 State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou , Gansu 730000 , China. , (China)
  • 2 College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences , Peking University , Beijing 100871 , China. , (China)
  • 3 Department of Materials and Environmental Chemistry , Stockholm University , Stockholm 10691 , Sweden. , (Sweden)
  • 4 Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071 , China. , (China)
Type
Published Article
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society
Publication Date
Jun 06, 2018
Volume
140
Issue
22
Pages
6763–6766
Identifiers
DOI: 10.1021/jacs.8b03169
PMID: 29779370
Source
Medline
License
Unknown

Abstract

We report herein the first example of interpenetration isomerism in covalent organic frameworks (COFs). As a well-known three-dimensional (3D) COF, COF-300 was synthesized and characterized by the Yaghi group in 2009 as a 5-fold interpenetrated diamond structure ( dia-c5 topology). We found that adding an aging process prior to the reported synthetic procedure afforded the formation of an interpenetration isomer, dia-c7 COF-300. The 7-fold interpenetrated diamond structure of this new isomer was identified by powder X-ray diffraction and rotation electron diffraction analyses. Furthermore, we proposed a universal formula to accurately determine the number of interpenetration degrees of dia-based COFs from only the unit cell parameters and the length of the organic linker. This work not only provides a novel example to the category of interpenetration isomerism but also provides new insights for the further development of 3D COFs.

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