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Solid-state natural abundance Mg-25 NMR studies of Na(2)MgEDTA center dot 4H(2)O - a possible new reference compound for Mg-25 NMR spectroscopy
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Freitas, Jair C. C., Wong, Alan and Smith, Mark E. (2009) Solid-state natural abundance Mg-25 NMR studies of Na(2)MgEDTA center dot 4H(2)O - a possible new reference compound for Mg-25 NMR spectroscopy. Magnetic Resonance in Chemistry, Vol.47 (No.1). pp. 9-15. doi:10.1002/mrc.2328 ISSN 0749-1581.
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Official URL: http://dx.doi.org/10.1002/mrc.2328
Abstract
Natural abundance solid-state Mg-25 NMR measurements were made of the disodium salt of magnesium ethylenediaminete-traacetate tetrahydrate (Na(2)MgEDTA center dot 4H(2)O). Both magic angle spinning (MAS) and static experiments were employed to determine the quadrupole coupling constant (C-q) and the asymmetry parameter (eta(q)) of the electric field gradient (EFG) tensor associated with Mg-25 in this compound, giving the values C-q = 1.675(5) MHz and eta(q) = 0.15(1). The isotropic chemical shift was determined to be delta(iso) = 0.25(10) ppm (relative to 11 M MgCl2 aqueous solution) and a small chemical shift anisotropy (CSA) contribution (similar to-13 ppm) was detected, one of the first CSA reports in Mg-25 NMR. This compound exhibited remarkably good Mg-25 NMR sensitivity, due to its fast spin-lattice relaxation and modest quadrupole coupling, which allowed its use as a secondary shift reference and as a test sample for the implementation and optimisation of signal-enhancement methods in Mg-25 NMR spectroscopy, such as double frequency sweeps (DFS) and the use of adiabatic hyperbolic secant (HS) and WURST pulses. Copyright (C) 2008 John Wiley & Sons, Ltd.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
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Divisions: | Administration > University Executive Office Faculty of Science, Engineering and Medicine > Science > Physics |
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Journal or Publication Title: | Magnetic Resonance in Chemistry | ||||
Publisher: | John Wiley & Sons Ltd. | ||||
ISSN: | 0749-1581 | ||||
Official Date: | January 2009 | ||||
Dates: |
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Volume: | Vol.47 | ||||
Number: | No.1 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 9-15 | ||||
DOI: | 10.1002/mrc.2328 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | CNPq, Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), Natural Sciences and Engineering Research Council (Canada), CAPES, Federal University of Espirito Santo (Brazil) |
Data sourced from Thomson Reuters' Web of Knowledge
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