Coordination nano-space as stage of hydrogen ortho–para conversion. Issue 7 (July 2015)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Royal Society open science. Volume 2:Issue 7(2015)
• Publication Date: 2015-07
• Subjects: hydrogen storage porous coordination polymer -- structure of absorbed H2 -- ortho–para conversion; Science -- Periodicals; 500
• DOI: 10.1098/rsos.150006
• Languages: English
• ISSNs: 2054-5703

Abstract

Abstract : 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.