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Related Experiment Videos

Double-quantum dipolar recoupling at high magic-angle spinning rates.

Per Eugen Kristiansen1, Dan J Mitchell, Jeremy N S Evans

  • 1School of Molecular Biosciences, Washington State University, Pullman, 99164-4660, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 27, 2002
PubMed
Summary

Researchers investigated homonuclear double-quantum recoupling sequences, developing new RN sequences like R18(10)(5). This technique effectively recouples dipolar couplings at high magic-angle spinning rates, proving useful in INADEQUATE experiments.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Quantum recoupling techniques in NMR.

Background:

  • Homonuclear double-quantum recoupling sequences are crucial for obtaining structural information in solid-state NMR.
  • The RN family of sequences offers a framework for developing efficient recoupling methods.

Purpose of the Study:

  • To fully investigate homonuclear double-quantum recoupling sequences based on the RN family (N <= 20).
  • To develop and apply new RN sequences for enhanced dipolar coupling recoupling.
  • To assess the performance of these sequences at high magic-angle spinning rates.

Main Methods:

  • Theoretical investigation of the RN family of recoupling sequences.
  • Application and experimental validation of new sequences: R16(6)(5), R18(8)(5), and R18(10)(5).

Related Experiment Videos

  • High magic-angle spinning rates (up to 39 kHz) were employed.

    • Main Results:

    • Several new RN sequences were identified and tested.
    • The R18(10)(5) sequence demonstrated effective recoupling of dipolar couplings.
    • Successful application of R18(10)(5) in an INADEQUATE experiment at a 30 kHz spinning rate.

    Conclusions:

    • The R18(10)(5) sequence is a powerful tool for recoupling dipolar interactions in solid-state NMR.
    • This technique enables efficient recoupling at very high magic-angle spinning rates.
    • The developed sequences advance the capabilities of solid-state NMR for structural analysis.