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Confined water-mediated high proton conduction in hydrophobic channel of a synthetic nanotube

Author

Listed:
  • Ken-ichi Otake

    (Kyoto University, Kitashirakawa-Oiwakecho
    Kyoto University)

  • Kazuya Otsubo

    (Kyoto University, Kitashirakawa-Oiwakecho)

  • Tokutaro Komatsu

    (Kyoto University, Kitashirakawa-Oiwakecho
    Nihon University)

  • Shun Dekura

    (Kyoto University, Kitashirakawa-Oiwakecho
    The University of Tokyo)

  • Jared M. Taylor

    (Kyoto University, Kitashirakawa-Oiwakecho
    University of Calgary)

  • Ryuichi Ikeda

    (Kyoto University, Kitashirakawa-Oiwakecho)

  • Kunihisa Sugimoto

    (Japan Synchrotron Radiation Research Institute (JASRI))

  • Akihiko Fujiwara

    (Japan Synchrotron Radiation Research Institute (JASRI)
    Kwansei Gakuin University)

  • Chien-Pin Chou

    (Waseda University)

  • Aditya Wibawa Sakti

    (Waseda University)

  • Yoshifumi Nishimura

    (Waseda University)

  • Hiromi Nakai

    (Waseda University
    Waseda University
    Kyoto University)

  • Hiroshi Kitagawa

    (Kyoto University, Kitashirakawa-Oiwakecho)

Abstract

Water confined within one-dimensional (1D) hydrophobic nanochannels has attracted significant interest due to its unusual structure and dynamic properties. As a representative system, water-filled carbon nanotubes (CNTs) are generally studied, but direct observation of the crystal structure and proton transport is difficult for CNTs due to their poor crystallinity and high electron conduction. Here, we report the direct observation of a unique water-cluster structure and high proton conduction realized in a metal-organic nanotube, [Pt(dach)(bpy)Br]4(SO4)4·32H2O (dach: (1R, 2R)-(–)-1,2-diaminocyclohexane; bpy: 4,4’-bipyridine). In the crystalline state, a hydrogen-bonded ice nanotube composed of water tetramers and octamers is found within the hydrophobic nanochannel. Single-crystal impedance measurements along the channel direction reveal a high proton conduction of 10−2 Scm−1. Moreover, fast proton diffusion and continuous liquid-to-solid transition are confirmed using solid-state 1H-NMR measurements. Our study provides valuable insight into the structural and dynamical properties of confined water within 1D hydrophobic nanochannels.

Suggested Citation

  • Ken-ichi Otake & Kazuya Otsubo & Tokutaro Komatsu & Shun Dekura & Jared M. Taylor & Ryuichi Ikeda & Kunihisa Sugimoto & Akihiko Fujiwara & Chien-Pin Chou & Aditya Wibawa Sakti & Yoshifumi Nishimura & , 2020. "Confined water-mediated high proton conduction in hydrophobic channel of a synthetic nanotube," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14627-z
    DOI: 10.1038/s41467-020-14627-z
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    Cited by:

    1. Yuanxi Yu & Chenxing Yang & Matteo Baggioli & Anthony E. Phillips & Alessio Zaccone & Lei Zhang & Ryoichi Kajimoto & Mitsutaka Nakamura & Dehong Yu & Liang Hong, 2022. "The ω3 scaling of the vibrational density of states in quasi-2D nanoconfined solids," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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