Cubic cesium hydrogen silicododecatungstate with anisotropic morphology and polyoxometalate vacancies exhibiting selective water sorption and cation-exchange properties

Yoshiyuki Ogasawara, Sayaka Uchida, Toshiaki Maruichi, Ryo Ishikawa, Naoya Shibata, Yuichi Ikuhara, Noritaka Mizuno

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    A cesium hydrogen silicododecatungstate Cs3.0H 0.3[SiW12O40]0.83·3.0H 2O (CsSiW) with a cubic cell and anion ([SiW12O 40]4-) vacancies is synthesized, and the anion vacancies are utilized for selective water sorption and exchange of monovalent cations. Compound CsSiW consists of highly crystalline particles with a flat rhombic bipyramidal morphology, and the anisotropic morphology is reported for the first time among the cubic solid POM compounds. Due to the high crystallinity and flatness of CsSiW, direct atomic images (heavy cesium and tungsten atoms) are observed for the first time in solid POM compounds. The electron-microscopic images suggest that CsSiW grows through (i) formation of [Cs3SiW 12O40]- followed by adsorption of Cs +, (ii) then parallel to the {110} plane, forming plates, and (iii) perpendicular to the {110} plane accompanied by the generation of anion vacancies. The mismatch between anion to cation site ratio (1:3) and cation to anion charge ratio (1:4) would be crucial for the anisotropic crystal growth and generation of anion vacancies.

    Original languageEnglish
    Pages (from-to)905-911
    Number of pages7
    JournalChemistry of Materials
    Volume25
    Issue number6
    DOIs
    Publication statusPublished - 2013 Mar 26

    Keywords

    • anion vacancy
    • anisotropic morphology
    • cubic structure
    • ion-exchange
    • polyoxometalate
    • water sorption

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Materials Chemistry

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