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A 3D experiment that provides isotropic homonuclear correlations of half-integer quadrupolar nuclei
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Iuga, Dinu, Holland, Diane and Dupree, Ray (2014) A 3D experiment that provides isotropic homonuclear correlations of half-integer quadrupolar nuclei. Journal of Magnetic Resonance, Volume 246 . pp. 122-129. doi:10.1016/j.jmr.2014.07.003 ISSN 1090-7807.
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Official URL: http://dx.doi.org/10.1016/j.jmr.2014.07.003
Abstract
Two 3D experiments, capable of producing enhanced resolution two-spin double-quantum (DQ) homonuclear correlations for half-integer quadrupolar nuclei, are described. The first uses a split-t1 MQMAS sequence followed by a sandwiched oR3 symmetry-based dipolar recoupling sequence to directly excite DQ coherences. In this case an isotropic single-quantum (SQ) coherence starts the homonuclear DQ excitation. In the second experiment a single strong pulse is used to create triple quantum (TQ) coherence followed by a further single pulse conversion to zero-order before a non-sandwiched oR3 DQ sequence. The first experiment is demonstrated using 87Rb in RbNO3, with three Rb sites in a ∼5 ppm range, and the second to 11B in caesium triborate, CsB3O5, with two three-coordinated sites separated by ∼2 ppm and one four-coordinated boron site. In both cases, all sites are clearly resolved and their connections observed. The second experiment has higher sensitivity and a good signal to noise is obtained in a reasonable time despite the long T1 relaxation time of 11B in this material.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | Journal of Magnetic Resonance | ||||||||
Publisher: | Academic Press | ||||||||
ISSN: | 1090-7807 | ||||||||
Official Date: | 21 July 2014 | ||||||||
Dates: |
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Volume: | Volume 246 | ||||||||
Page Range: | pp. 122-129 | ||||||||
DOI: | 10.1016/j.jmr.2014.07.003 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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