Observation of quasi-one dimensional proton conductions in molecular porous crystal [CoIII(H2bim)3](TMA).20H2O

Hiroshi Matsui, Yuki Ohhta, Chihiro Iida, Mayumi Horii, Makoto Tadokoro

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15 Citations (Scopus)


Triple-layered hydration structure called water nanotube (WNT) is created inside the hydrophilic nanochannel framework in [CoIII(H 2bim)3](TMA).20H2O. The present infrared spectral analysis for OH stretching vibrations reveals that the mobile water molecules in WNT fundamentally occupy the regular coordination tetrahedrally arranged by hydrogen bonds. The noncontact microwave experiment demonstrates that the thermal activation-type electrical conductivity along the tube axis reaches to the identical order of 10-2 (ωcm)-1 to the high protonic conductivity in Nafion. The pronounced isotope effect and distinct anisotropy of the conductivity prove the occurrence of quasi one-dimensional (Q1D) proton conductions through the well regulated water network.

Original languageEnglish
Article number103601
JournalJournal of the Physical Society of Japan
Issue number10
Publication statusPublished - 2010 Oct


  • Confined water
  • Ice nanotube
  • Infrared spectroscopy
  • Microwave conductivity
  • Porous crystal
  • Proton conduction
  • Water nanotube


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