Skip to main content

Enhancement of the effect of small anisotropies in magic-angle spinning nuclear magnetic resonance

Publication ,  Journal Article
Raleigh, DP; Kolbert, AC; Oas, TG; Levitt, MH; Griffin, RG
Published in: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
December 1, 1988

A variety of novel methods in magic-angle spinning NMR is described. The effects have in common the enhancement of the influence of small anisotropies on the NMR spectrum by deliberate intervention, i.e. either by applying pulses, carefully chosen continuous r.f. fields, or by adjustment of the spinning speed. It is shown that rotational sidebands in two-dimensional spin-echo NMR are often much larger than in one-dimensional NMR, owing to the interference of the π-pulse with the rotational echo formation. It is also demonstrated that in systems containing heteronuclear spin pairs the application of a weak continuous r.f. field of carefully chosen intensity can reintroduce small heteronuclear couplings into the spectrum. This is known as rotational resonance recoupling and is due to the interference of coherent spin rotations with the normal averaging effect of the sample rotation. Related effects can occur in homonuclear spin systems when an integer multiple of the spinning speed matches the difference between isotropic chemical shifts. In this case no extra r.f. field is necessary to amplify the effect of the non-secular parts of the dipolar interaction. Greatly enhanced polarization exchange as well as strong spectral effects are demonstrated. The application of these novel methods to the measurement of small interaction tensors and thereby to the extraction of important structural information is discussed.

Duke Scholars

Published In

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases

DOI

ISSN

0300-9599

Publication Date

December 1, 1988

Volume

84

Issue

11

Start / End Page

3691 / 3711
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Raleigh, D. P., Kolbert, A. C., Oas, T. G., Levitt, M. H., & Griffin, R. G. (1988). Enhancement of the effect of small anisotropies in magic-angle spinning nuclear magnetic resonance. Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 84(11), 3691–3711. https://doi.org/10.1039/F19888403691
Raleigh, D. P., A. C. Kolbert, T. G. Oas, M. H. Levitt, and R. G. Griffin. “Enhancement of the effect of small anisotropies in magic-angle spinning nuclear magnetic resonance.” Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases 84, no. 11 (December 1, 1988): 3691–3711. https://doi.org/10.1039/F19888403691.
Raleigh DP, Kolbert AC, Oas TG, Levitt MH, Griffin RG. Enhancement of the effect of small anisotropies in magic-angle spinning nuclear magnetic resonance. Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases. 1988 Dec 1;84(11):3691–711.
Raleigh, D. P., et al. “Enhancement of the effect of small anisotropies in magic-angle spinning nuclear magnetic resonance.” Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, vol. 84, no. 11, Dec. 1988, pp. 3691–711. Scopus, doi:10.1039/F19888403691.
Raleigh DP, Kolbert AC, Oas TG, Levitt MH, Griffin RG. Enhancement of the effect of small anisotropies in magic-angle spinning nuclear magnetic resonance. Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases. 1988 Dec 1;84(11):3691–3711.

Published In

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases

DOI

ISSN

0300-9599

Publication Date

December 1, 1988

Volume

84

Issue

11

Start / End Page

3691 / 3711