Atomic observation and structural evolution of covalent organic framework rotamers
Dynamic 3D covalent organic frameworks (COFs) have shown concerted structural transformation and adaptive gas adsorption due to the conformational diversity of organic linkers. However, the isolation and observation of COF rotamers constitute undergoing challenges due to their comparable free energy and subtle rotational energy barrier. Here, we report the atomic-level observation and structural evolution of COF rotamers by cryo-3D electron diffraction and synchrotron powder X-ray diffraction. Specifically, we optimize the crystallinity and morphology of COF-320 to manifest its coherent dynamic responses upon adaptive inclusion of guest molecules. We observe a significant crystal expansion of 29 vol% upon hydration and a giant swelling with volume change up to 78 vol% upon solvation. We record the structural evolution from a non-porous contracted phase to two narrow-pore intermediate phases and the fully opened expanded phase using n-butane as a stabilizing probe at ambient conditions. We uncover the rotational freedom of biphenylene giving rise to significant conformational changes on the diimine motifs from synclinal to syn-periplanar and anticlinal rotamers. We illustrate the 10-fold increment of pore volumes and 100% enhancement of methane uptake capacity of COF-320 at 100 bar and 298 K. The present findings shed light on the design of smarter organic porous materials to maximize host-guest interaction and boost gas uptake capacity through progressive structural transformation.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:121 |
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| Enthalten in: |
Proceedings of the National Academy of Sciences of the United States of America - 121(2024), 5 vom: 30. Jan., Seite e2320237121 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Zeng, Tengwu [VerfasserIn] |
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| Links: |
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| Themen: |
Covalent organic frameworks |
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| Anmerkungen: |
Date Revised 04.02.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1073/pnas.2320237121 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM367433095 |
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| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Dynamic 3D covalent organic frameworks (COFs) have shown concerted structural transformation and adaptive gas adsorption due to the conformational diversity of organic linkers. However, the isolation and observation of COF rotamers constitute undergoing challenges due to their comparable free energy and subtle rotational energy barrier. Here, we report the atomic-level observation and structural evolution of COF rotamers by cryo-3D electron diffraction and synchrotron powder X-ray diffraction. Specifically, we optimize the crystallinity and morphology of COF-320 to manifest its coherent dynamic responses upon adaptive inclusion of guest molecules. We observe a significant crystal expansion of 29 vol% upon hydration and a giant swelling with volume change up to 78 vol% upon solvation. We record the structural evolution from a non-porous contracted phase to two narrow-pore intermediate phases and the fully opened expanded phase using n-butane as a stabilizing probe at ambient conditions. We uncover the rotational freedom of biphenylene giving rise to significant conformational changes on the diimine motifs from synclinal to syn-periplanar and anticlinal rotamers. We illustrate the 10-fold increment of pore volumes and 100% enhancement of methane uptake capacity of COF-320 at 100 bar and 298 K. The present findings shed light on the design of smarter organic porous materials to maximize host-guest interaction and boost gas uptake capacity through progressive structural transformation | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a covalent organic frameworks | |
| 650 | 4 | |a dynamic response | |
| 650 | 4 | |a gas storage | |
| 650 | 4 | |a porous materials | |
| 650 | 4 | |a reticular chemistry | |
| 700 | 1 | |a Ling, Yang |e verfasserin |4 aut | |
| 700 | 1 | |a Jiang, Wentao |e verfasserin |4 aut | |
| 700 | 1 | |a Yao, Xuan |e verfasserin |4 aut | |
| 700 | 1 | |a Tao, Yu |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Shan |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Huiyu |e verfasserin |4 aut | |
| 700 | 1 | |a Yang, Tieying |e verfasserin |4 aut | |
| 700 | 1 | |a Wen, Wen |e verfasserin |4 aut | |
| 700 | 1 | |a Jiang, Shan |e verfasserin |4 aut | |
| 700 | 1 | |a Zhao, Yingbo |e verfasserin |4 aut | |
| 700 | 1 | |a Ma, Yanhang |e verfasserin |4 aut | |
| 700 | 1 | |a Zhang, Yue-Biao |e verfasserin |4 aut | |
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