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 () and Hiroshi Kitagawa ()
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Ken-ichi Otake: Kyoto University, Kitashirakawa-Oiwakecho
Kazuya Otsubo: Kyoto University, Kitashirakawa-Oiwakecho
Tokutaro Komatsu: Kyoto University, Kitashirakawa-Oiwakecho
Shun Dekura: Kyoto University, Kitashirakawa-Oiwakecho
Jared M. Taylor: Kyoto University, Kitashirakawa-Oiwakecho
Ryuichi Ikeda: Kyoto University, Kitashirakawa-Oiwakecho
Kunihisa Sugimoto: Japan Synchrotron Radiation Research Institute (JASRI)
Akihiko Fujiwara: Japan Synchrotron Radiation Research Institute (JASRI)
Chien-Pin Chou: Waseda University
Aditya Wibawa Sakti: Waseda University
Yoshifumi Nishimura: Waseda University
Hiromi Nakai: Waseda University
Hiroshi Kitagawa: Kyoto University, Kitashirakawa-Oiwakecho

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-14627-z

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