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

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, Hiromi Nakai, Hiroshi Kitagawa

研究成果: Article

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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.

元の言語English
記事番号843
ジャーナルNature communications
11
発行部数1
DOI
出版物ステータスPublished - 2020 12 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Otake, K. I., Otsubo, K., Komatsu, T., Dekura, S., Taylor, J. M., Ikeda, R., Sugimoto, K., Fujiwara, A., Chou, C. P., Sakti, A. W., Nishimura, Y., Nakai, H., & Kitagawa, H. (2020). Confined water-mediated high proton conduction in hydrophobic channel of a synthetic nanotube. Nature communications, 11(1), [843]. https://doi.org/10.1038/s41467-020-14627-z