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Direct visual observation of pedal motion-dependent flexibility of single covalent organic frameworks

Author

Listed:
  • Hongbin Chi

    (Southwest University of Science and Technology)

  • Yang Liu

    (Southwest University of Science and Technology
    Sichuan College of Architectural Technology)

  • Ziyi Li

    (Southwest University of Science and Technology)

  • Wanxin Chen

    (Southwest University of Science and Technology)

  • Yi He

    (Southwest University of Science and Technology)

Abstract

Flexible covalent organic frameworks (COFs) have been studied for applications containing sorption, selective separation, and catalysis. How to correlate the microscopic structure with flexibility in COFs is a great challenge. Herein, we visually track the flexible deformation behaviors of single COF-300 and COF-300-AR particles in response to solvent vapour guests with dark-field microscopy (DFM) in an in operando manner. COF-300-AR with freely-rotating C-N single bonds are synthesized by the reduction of imine-based COF-300 consisting of rigid C=N double bonds without changing topological structure and crystallinity. Unexpectedly, we observe that the flexible deformation of COF-300 is extremely higher than that of COF-300-AR despite it bears many C-N single bonds, clearly illustrating the apparent flexibility decrease of COF-300 after reduction. The high spatiotemporal resolution of DFM enables the finding of inter-particle variations of the flexibility among COF-300 crystals. Experimental characterizations by variable-temperature X-ray diffraction and infrared spectroscopy as well as theoretical calculations demonstrate that the flexible deformation of COF-300 is ascribed to the pedal motion around rigid C=N double bonds. These observations provide new insights into COF flexibility.

Suggested Citation

  • Hongbin Chi & Yang Liu & Ziyi Li & Wanxin Chen & Yi He, 2023. "Direct visual observation of pedal motion-dependent flexibility of single covalent organic frameworks," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40831-8
    DOI: 10.1038/s41467-023-40831-8
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    References listed on IDEAS

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    1. Tianqiong Ma & Lei Wei & Lin Liang & Shawn Yin & Le Xu & Jing Niu & Huadong Xue & Xiaoge Wang & Junliang Sun & Yue-Biao Zhang & Wei Wang, 2020. "Diverse crystal size effects in covalent organic frameworks," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
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