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High-resolution heteronuclear correlation between quadrupolar nuclei.

J C Chan1

  • 1Institut für Physikalische Chemie, Westfälische Wilhelms-Universität Münster, Schlossplatz 7, Münster, D48149, Germany. jccchan@qpc048.uni-muenster.de

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 25, 1999
PubMed
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Magic angle spinning and cross-polarization techniques reveal structural details in magnesium aluminoborate glass. Six-coordinate aluminum sites are found to bond with tetrahedral boron sites.

Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Materials Science
  • Glass Chemistry

Background:

  • Understanding the local structure of amorphous materials like glasses is crucial for tailoring their properties.
  • Distinguishing between different coordination environments of quadrupolar nuclei (e.g., Boron-11 and Aluminum-27) can be challenging using conventional NMR techniques.

Purpose of the Study:

  • To develop and apply advanced solid-state NMR methods for high-resolution structural analysis of quadrupolar nuclei in glasses.
  • To elucidate the coordination environment and interatomic correlations between boron and aluminum in magnesium aluminoborate glass.

Main Methods:

  • Implementation of multiple-quantum magic angle spinning (MQMAS) with double-quantum (DQ) cross-polarization (CP) for heteronuclear correlation.

Related Experiment Videos

  • Acquisition of a two-dimensional (2D) 11B[27Al] high-resolution heteronuclear correlation NMR spectrum.

    • Main Results:

    • Successful combination of MQMAS and DQ-CP techniques for resolving complex spectral overlaps.
    • Determination of specific coordination preferences between boron and aluminum species.
    • Identification of preferential coordination between six-coordinate aluminum sites (AlO6) and tetrahedral boron sites (BO4).

    Conclusions:

    • The advanced 2D NMR methodology provides unprecedented resolution for studying amorphous materials.
    • The findings reveal a specific structural motif in magnesium aluminoborate glass, with AlO6 coordinating to BO4.
    • This detailed structural information is vital for the design and application of advanced glass materials.