Research Article

On the orientational dependence of resolution in 1H solid-state NMR, and its role in MAS, CRAMPS and delayed-acquisition experiments

  1. Vadim E. Zorin1,
  2. Benedicte Elena2,
  3. Anne Lesage2,
  4. Lyndon Emsley2,
  5. Paul Hodgkinson1,*

Article first published online: 21 DEC 2007

DOI: 10.1002/mrc.2108

Issue

Magnetic Resonance in Chemistry

Magnetic Resonance in Chemistry

Special Issue: New techniques in solid-state NMR

Volume 45, Issue S1, pages S93–S100, December 2007

Additional Information

How to Cite

Zorin, V. E., Elena, B., Lesage, A., Emsley, L. and Hodgkinson, P. (2007), On the orientational dependence of resolution in 1H solid-state NMR, and its role in MAS, CRAMPS and delayed-acquisition experiments. Magn. Reson. Chem., 45: S93–S100. doi: 10.1002/mrc.2108

Author Information

  1. 1

    Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK

  2. 2

    Laboratoire de chimie, UMR 5182 CNRS/ENS Lyon, Ecole normale supérieure de Lyon, 46 allée d'Italie, 69364 Lyon, France

*Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.

Publication History

  1. Issue published online: 21 DEC 2007
  2. Article first published online: 21 DEC 2007
  3. Manuscript Accepted: 16 SEP 2007
  4. Manuscript Revised: 14 SEP 2007
  5. Manuscript Received: 11 JUL 2007

Funded by

  • Royal Society
  • CNRS
  • EPSRC. Grant Number: EP/D057159/1
  • Agence National de la Recherche
  • The Royal Society, CNRS, Agence National de la Recherche

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Keywords:

  • solid-state NMR;
  • numerical simulation;
  • homonuclear decoupling;
  • H-1;
  • magic-angle spinning

Abstract

Numerical simulations and experiments are used to show that the spin dynamics of the dipolar-coupled networks in solids is often strongly dependent on crystallite orientation. In particular, different rates of dephasing of the magnetisation mean that NMR signals obtained at longer dephasing times are dominated by orientations in which the local dipolar coupling strength is relatively weak. This often leads to a distinct improvement in spectral resolution as the dephasing time is increased. The effects are particularly noticeable under magic-angle spinning (MAS), but are also observed when homonuclear decoupling is used to reduce the rate of dipolar dephasing. Numerical simulation is seen to be a powerful and easily used tool for understanding the behaviour of solid-state NMR experiments involving dipolar-coupled networks. The implications for solid-state NMR spectra of abundant spins acquired under MAS and homonuclear decoupling are discussed, as well as insights provided into the performance of ‘delayed-acquisition’ and ‘constant-time’ experiments. Copyright © 2007 John Wiley & Sons, Ltd.

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