Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 203, Issue 1, Pages 113-128Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2009.12.009
Keywords
Solid-state NMR; Double quanta; Ultra-fast MAS; H-1 and F-19; High field magnet
Funding
- TGE RMN THC [FR-3050]
- National Natural Science Foundation of China [20773159, 20673139, 20933009]
- National Basic Research Program of China [2009CB918600]
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We describe dipolar recoupling methods that accomplish. at high magic-angle spinning (MAS) frequencies, the excitation of double-quantum (DQ) coherences between spin-1/2 nuclei We employ rotor-synchronized symmetry-based pulse sequences which are either gamma-encoded or non-gamma-encoded The sensitivity and the robustness to both chemical-shift anisotropy and offset are examined. We also compare different techniques to avoid signal folding in the indirect dimension of two-dimensional double-quantum <-> single-quantum (DQ-SQ) spectra This comprehensive analysis results in the identification of satisfactory conditions for dipolar F-19-F-19 recoupling at high magnetic fields and high MAS frequencies The utility of these recoupling methods is demonstrated with high-resolution DQ-SQ NMR spectra, which allow probing F-19-F-19 proximities in powered fluoroluminates (C) 2009 Elsevier Inc All rights reserved
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