title: Glass Formation of a Coordination Polymer Crystal for Enhanced Proton Conductivity and Material Flexibility.
abstract: The glassy state of a two-dimensional (2D) Cd(2+) coordination polymer crystal was prepared by a solvent-free mechanical milling process. The glassy state retains the 2D structure of the crystalline material, albeit with significant distortion, as characterized by synchrotron X-ray analyses and solid-state multinuclear NMR spectroscopy. It transforms to its original crystal structure upon heating. Thus, reversible crystal-to-glass transformation is possible using our new processes. The glass state displays superior properties compared to the crystalline state; specifically, it shows anhydrous proton conductivity and a dielectric constant two orders of magnitude greater than the crystalline material. It also shows material flexibility and transparency.
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Wenqian
authors.initials: W
authors.lastname: Chen
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan. horike@sbchem.kyoto-u.ac.jp.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Horike
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Daiki
authors.initials: D
authors.lastname: Umeyama
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Ogiwara
authors.affiliation: DENSO CORPORATION, 1-1 Showa-cho, Kariya, Aichi, 448-8661, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Itakura
authors.affiliation: Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Cédric
authors.initials: C
authors.lastname: Tassel
authors.affiliation: Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Goto
authors.affiliation: Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kageyama
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan. kitagawa@icems.kyoto-u.ac.jp.|Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan. kitagawa@icems.kyoto-u.ac.jp.
authors.forename: Susumu
authors.initials: S
authors.lastname: Kitagawa
keywords: coordination polymers; glasses; mechanical properties; mechanochemistry; proton conductivity