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Article Dans Une Revue Journal of Magnetic Resonance Année : 2009

Double-quantum homonuclear NMR correlation spectroscopy of quadrupolar nuclei subjected to magic-angle spinning and high magnetic field

Résumé

We present a new application of the symmetry-based dipolar recoupling scheme, for exciting directly double-quantum (2Q) coherences between the central transition of homonuclear half-integer quadrupolar nuclei. With respect to previously published 2Q-recoupling methods (M. Eden, D. Zhou, J. Yu, Chem. Phys. Lett. 431 (2006) 397), the sequence is used without π/2 bracketing pulses and with an original super-cycling. This leads to an improved efficiency (a factor of two for spin-5/2) and to a much higher robustness to radio-frequency field inhomogeneity and resonance offset. The 2Q-coherence excitation performances are demonstrated experimentally by 27Al NMR experiments on the aluminophosphates berlinite, VPI5, AlPO4-14, and AlPO4-CJ3. The two-dimensional 2Q–1Q correlation experiments incorporating these recoupling sequences allow the observation of 2Q cross-peaks between central transitions, even at high magnetic field where the difference in offset between octahedral and tetrahedral 27Al sites exceeds 10 kHz.

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Chimie

Dates et versions

hal-04562668 , version 1 (29-04-2024)

Identifiants

Citer

Q. Wang, B. Hu, Olivier Lafon, Julien Trebosc, F. Deng, et al.. Double-quantum homonuclear NMR correlation spectroscopy of quadrupolar nuclei subjected to magic-angle spinning and high magnetic field. Journal of Magnetic Resonance, 2009, Journal of Magnetic Resonance, 200, pp.251-260. ⟨10.1016/j.jmr.2009.07.009⟩. ⟨hal-04562668⟩
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