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

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

22015-07-01 , Royal Society
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.

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