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Ultrafast structural dynamics of carbon–carbon single-bond rotation in transient radical species at non-equilibrium

Author

Listed:
  • Seonggon Lee

    (Institute for Basic Science (IBS))

  • Hosung Ki

    (Institute for Basic Science (IBS))

  • Donghwan Im

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST))

  • Jungmin Kim

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST))

  • Yunbeom Lee

    (Institute for Basic Science (IBS))

  • Jain Gu

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST))

  • Alekos Segalina

    (Institute for Basic Science (IBS))

  • Jun Heo

    (Institute for Basic Science (IBS))

  • Yongjun Cha

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST))

  • Kyung Won Lee

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST))

  • Doyeong Kim

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST))

  • Jeongho Kim

    (Michuhol-gu)

  • Rory Ma

    (Pohang Accelerator Laboratory)

  • Jae Hyuk Lee

    (Pohang Accelerator Laboratory)

  • Hyotcherl Ihee

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST))

Abstract

Bond rotation is an important phenomenon governing the fate of reactions. In particular, heterogeneously substituted ethane derivatives provide distinct structural conformations around the bond, empowering them as ideal systems for studying the rotation along carbon-containing single bonds. However, structural dynamics of ultrafast single-bond rotation, especially along C–C• bonds, have remained elusive as tracking the detailed changes in structural parameters during the rotational isomerization is challenging with conventional spectroscopic tools. Here, we employ femtosecond time-resolved X-ray liquidography to visualize the rotational isomerization between anti and gauche conformers of tetrafluoroiodoethyl radical (C2F4I•) and 1,2-tetrafluorodiiodoethane (C2F4I2), simultaneously. The TRXL data captures perturbations in conformer ratios and structures of each reacting species, revealing that the rotational isomerization of C2F4I• and C2F4I2 follows anti-to-gauche and gauche-to-anti paths with time constants of 1.2 ps and 26 ps, respectively. These findings also align with the computational predictions. This work offers an atomic-level insight into the kinetics and structural dynamics of single-bond rotation.

Suggested Citation

  • Seonggon Lee & Hosung Ki & Donghwan Im & Jungmin Kim & Yunbeom Lee & Jain Gu & Alekos Segalina & Jun Heo & Yongjun Cha & Kyung Won Lee & Doyeong Kim & Jeongho Kim & Rory Ma & Jae Hyuk Lee & Hyotcherl , 2025. "Ultrafast structural dynamics of carbon–carbon single-bond rotation in transient radical species at non-equilibrium," Nature Communications, Nature, vol. 16(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57279-7
    DOI: 10.1038/s41467-025-57279-7
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    References listed on IDEAS

    as
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