Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202204899
Keywords
covalent organic frameworks; entanglement; high-valency; stereoscopic; gas separation
Categories
Funding
- Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang [2020R01002]
- Class D of Qianjiang Talent Program [ZD20011250001]
- Zhejiang University of Technology [2019125016829]
- National Natural Science Foundation of China [22075250, 22122505, 21771161]
- National Natural Science Foundation of China (NSFC) [21771191]
- Shandong Natural Science Fund [ZR2020KB010]
- Fundamental Research Funds for the Central Universities [19CX05001A]
- Opening Project of Jiangsu Province Engineering Research Center of Agricultural Breeding Pollution Control and Resource [2021ABPCR004]
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The structural diversity of 3D covalent organic frameworks (COFs) is limited, but can be expanded by introducing high-valency stereoscopic nodes. Researchers have created two 3D COFs with unique pore architectures and strong molecular binding sites, exhibiting excellent performance in gas separation.
The structural diversity of three-dimensional (3D) covalent organic frameworks (COFs) are limited as there are only a few choices of building units with multiple symmetrically distributed connection sites. To date, 4 and 6-connected stereoscopic nodes with T-d, D-3h, D-3d and C-3 symmetries have been mostly reported, delivering limited 3D topologies. We propose an efficient approach to expand the 3D COF repertoire by introducing a high-valency quadrangular prism (D-4h) stereoscopic node with a connectivity of eight, based on which two isoreticular 3D imine-linked COFs can be created. Low-dose electron microscopy allows the direct visualization of their 2-fold interpenetrated bcu networks. These 3D COFs are endowed with unique pore architectures and strong molecular binding sites, and exhibit excellent performance in separating C2H2/CO2 and C2H2/CH4 gas pairs. The introduction of high-valency stereoscopic nodes would lead to an outburst of new topologies for 3D COFs.
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