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Efficient dipolar double quantum filtering under magic angle spinning without a (1)H decoupling field.

Joseph M Courtney1, Chad M Rienstra2

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|June 18, 2016
PubMed
Summary
This summary is machine-generated.

Efficient dipolar double quantum (DQ) filtering in organic solids requires specific conditions. High (13)C nutation frequencies and higher symmetry values (n≥7) are key for effective recoupling, with optimal performance often achieved without a (1)H field.

Keywords:
Dipolar recouplingDouble quantum filteringFast magic-angle spinningHeteronuclear decouplingProteins

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Area of Science:

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

Background:

  • Dipolar double quantum (DQ) filtering is a crucial technique in solid-state NMR for simplifying complex spectra.
  • Understanding recoupling sequences and their dependence on experimental parameters is vital for optimizing DQ filtering.

Purpose of the Study:

  • To systematically investigate the efficiency of dipolar double quantum (DQ) filtering in (13)C-labeled organic solids.
  • To determine the optimal parameters for the SPC-n recoupling sequence, including symmetry values (n) and (13)C nutation frequencies.
  • To analyze the influence of heteronuclear decoupling on DQ filtering performance.

Main Methods:

  • Utilized the SPC-n recoupling sequence with symmetry values (n) ranging from 3 to 11.
  • Studied (13)C-labeled organic solids under various magic-angle spinning rates.
  • Investigated the dependence of DQ filtering efficiency on (13)C nutation frequency and applied (1)H fields.

Main Results:

  • Efficient recoupling was achieved for symmetry values n≥7 at (13)C nutation frequencies ≥100 kHz.
  • Heteronuclear decoupling interference between (13)C and (1)H fields was identified as a major factor influencing DQ filtering efficiency.
  • Optimal performance was observed without an applied (1)H field for (13)C nutation frequencies >75 kHz.
  • Symmetry conditions as low as n=3 performed adequately at spinning rates >20 kHz.

Conclusions:

  • The study provides guidelines for optimizing dipolar double quantum (DQ) filtering in (13)C-labeled organic solids.
  • Effective DQ filtering relies on high (13)C nutation frequencies and appropriate SPC-n symmetry values.
  • Minimizing heteronuclear decoupling interference is critical for maximizing DQ filtering efficiency.