Local environments and dynamics of hydrogen atoms in protonated forms of ion-exchangeable layered perovskites estimated by solid-state 1H NMR

Shinsuke Tani, Yoshihiko Komori, Shigenobu Hayashi, Yoshiyuki Sugahara

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    Abstract

    The local environments and dynamics of hydrogen atoms in five samples of protonated forms of ion-exchangeable layered perovskites, Dion-Jacobson-type H[LaNb2O7] and H[LaTa2O7], Ruddlesden-Popper-type H2[SrTa2O7] and H2[La2Ti3O10], and H1.8[(Sr0.8Bi0.2)Ta2O7] derived from an Aurivillius phase, Bi2Sr2Ta2O9, have been investigated by solid-state 1H nuclear magnetic resonance spectroscopy (NMR). Solid-state 1H NMR with a magic-angle spinning technique conducted at room temperature reveals that the mean electron densities around the 1H nuclei in these protonated forms are relatively low, and that they decrease in the following order: H1.8[(Sr0.8Bi0.2)Ta2O7]>H[LaNb2O7]>H2[SrTa2O7]>H[LaTa2O7]>H2[La2Ti3O10]. The temperature-dependent solid-state 1H broad-line NMR spectra measured at 140-400 K reveal a decrease in the signal width for all of these five samples upon heating due to motional narrowing. The NMR spectra of H[LaNb2O7] and H[LaTa2O7] are different from the other three protonated forms due to the weaker dipole-dipole interactions at low temperatures and lower mobility of the hydrogen atoms at high temperatures.

    Original languageEnglish
    Pages (from-to)3357-3364
    Number of pages8
    JournalJournal of Solid State Chemistry
    Volume179
    Issue number11
    DOIs
    Publication statusPublished - 2006 Nov

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    Keywords

    • Layered perovskite
    • Magic-angle spinning
    • Motional narrowing
    • Protonated form
    • Solid-state H NMR
    • Variable-temperature measurement

    ASJC Scopus subject areas

    • Inorganic Chemistry
    • Physical and Theoretical Chemistry
    • Materials Chemistry

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