Coordination nano-space as stage of hydrogen ortho–para conversion

Takashi Kosone, Akihiro Hori, Eiji Nishibori, Yoshiki Kubota, Akio Mishima, Masaaki Ohba, Hiroshi Tanaka, Kenichi Kato, Jungeun Kim, José Antonio Real, Susumu Kitagawa, Masaki Takata

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)


    The ability to design and control properties of nano-sized space in porous coordination polymers (PCPs) would provide us with an ideal stage for fascinating physical and chemical phenomena. We found an interconversion of nuclear-spin isomers for hydrogen molecule H2 adsorbed in a Hofmann-type PCP, {Fe(pz)[Pd(CN)4]} (pz=pyrazine), by the temperature dependence of Raman spectra. The ortho (o)–para (p) conversion process of H2 is forbidden for an isolated molecule. The charge density study using synchrotron radiation X-ray diffraction reveals the electric field generated in coordination nano-space. The present results corroborate similar findings observed on different systems and confirm that o–p conversion can occur on non-magnetic solids and that electric field can induce the catalytic hydrogen o–p conversion.

    Original languageEnglish
    Article number150006
    JournalRoyal Society Open Science
    Issue number7
    Publication statusPublished - 2015 Jul


    • Hydrogen storage porous coordination polymer
    • Ortho–para conversion
    • Structure of absorbed H

    ASJC Scopus subject areas

    • General


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