title: Formation of a one-dimensional array of oxygen in a microporous metal-organic solid.
abstract: We report the direct observation of dioxygen molecules physisorbed in the nanochannels of a microporous copper coordination polymer by the MEM (maximum entropy method)/Rietveld method, using in situ high-resolution synchrotron x-ray powder diffraction measurements. The obtained MEM electron density revealed that van der Waals dimers of physisorbed O2 locate in the middle of nanochannels and form a one-dimensional ladder structure aligned to the host channel structure. The observed O-O stretching Raman band and magnetic susceptibilities are characteristic of the confined O2 molecules in one-dimensional nanochannels of CPL-1 (coordination polymer 1 with pillared layer structure).
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Kitaura
authors.forename: Susumu
authors.initials: S
authors.lastname: Kitagawa
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Kubota
authors.forename: Tatsuo C
authors.initials: TC
authors.lastname: Kobayashi
authors.forename: Koichi
authors.initials: K
authors.lastname: Kindo
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Mita
authors.forename: Akira
authors.initials: A
authors.lastname: Matsuo
authors.forename: Michihiro
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Ho-Chol
authors.initials: HC
authors.lastname: Chang
authors.forename: Tadashi C
authors.initials: TC
authors.lastname: Ozawa
authors.forename: Megumi
authors.initials: M
authors.lastname: Suzuki
authors.forename: Makoto
authors.initials: M
authors.lastname: Sakata
authors.forename: Masaki
authors.initials: M
authors.lastname: Takata