Selective Ion Exchange in Supramolecular Channels in the Crystalline State

Katsuya Ichihashi, Daisuke Konno, Kseniya Yu Maryunina, Katsuya Inoue, Kazuhiro Toyoda, Shogo Kawaguchi, Yoshiki Kubota, Yoko Tatewaki, Tomoyuki Akutagawa, Takayoshi Nakamura, Sadafumi Nishihara

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)


    Artificial ion channels are of increasing interest because of potential applications in biomimetics, for example, for realizing selective ion permeability through the transport and/or exchange of selected ions. However, selective ion transport and/or exchange in the crystalline state is rare, and to the best of our knowledge, such a process has not been successfully combined with changes in the physical properties of a material. Herein, by soaking single crystals of Li 2 ([18]crown-6) 3 [Ni(dmit) 2 ] 2 (H 2 O) 4 (1) in an aqueous solution containing K + , we succeeded in complete ion exchange of the Li + ions in 1 with K + ions in the solution, while maintaining the crystalline state of the material. This ion exchange with K + was selectively conducted even in mixed solutions containing K + as well as Na + /Li + . Furthermore, remarkable changes in the physical properties of 1 resulted from the ion exchange. Our finding enables not only the realization of selective ion permeability but also the development of highly sensitive biosensors and futuristic ion exchange agents, for example.

    Original languageEnglish
    Pages (from-to)4169-4172
    Number of pages4
    JournalAngewandte Chemie - International Edition
    Issue number13
    Publication statusPublished - 2019 Mar 22


    • ion channels
    • ion exchange
    • lithium
    • magnetic properties
    • solid-state structures

    ASJC Scopus subject areas

    • Catalysis
    • Chemistry(all)


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