High-pressure δ-Al(OH)3 and δ-AlOOH phases and isostructural hydroxides/oxyhydroxides: New structural insights from high-resolution1H and27Al NMR

    Research output: Contribution to journalArticlepeer-review

    62 Citations (Scopus)

    Abstract

    In order to shed light on the proton distributions and order/disorder in high-pressure δ-Al(OH)3 and δ-AlOOH phases, two-dimensional, high-resolution 1H CRAMPS (FSLG)-MAS NMR and 27Al 3QMAS NMR spectra have been obtained. For δ-Al(OH) 3, the 1H CRAMPS-MAS NMR revealed two peaks with an intensity ratio close to 2:1. The 27Al MAS and 3QMAS NMR suggest a single Al site with a well-defined local structure. For δ-AlOOH, the 1H and 27Al NMR indicate the presence of a single H and Al site each. These results are consistent with crystal structures refined from X-ray diffraction. For comparison, 1H MAS and CRAMPS-MAS NMR spectra were also obtained for several other hydroxides/oxyhydroxides, including In(OH)3 and InOOH that have similar structures to δ-Al(OH) 3 and δ-AlOOH, respectively. These data not only provide additional insights into the proton distributions in these important crystal structure classes but also together provide a better defined quantitative correlation between 1H chemical shift and hydrogen-bonding O⋯O distance.

    Original languageEnglish
    Pages (from-to)13156-13166
    Number of pages11
    JournalJournal of Physical Chemistry B
    Volume111
    Issue number46
    DOIs
    Publication statusPublished - Nov 22 2007

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

    Fingerprint

    Dive into the research topics of 'High-pressure δ-Al(OH)<sub>3</sub> and δ-AlOOH phases and isostructural hydroxides/oxyhydroxides: New structural insights from high-resolution<sup>1</sup>H and<sup>27</sup>Al NMR'. Together they form a unique fingerprint.

    Cite this