Off-angle correlation spectroscopy applied to spin-1/2 and quadrupolar nuclei |
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Authors: | P Hartmann C Jger J W Zwanziger |
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Institution: | a Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena, Germany b Department of Chemistry, Indiana University, Bloomington, IN 47405 USA |
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Abstract: | A two-dimensional correlation experiment is described, in which homonuclear dipolar couplings are used to realize through-space magnetization exchange on spin-1/2 (31P) and on quadrupolar nuclei (23Na and 11B). In the detection period, Magic Angle Spinning is applied to enhance resolution, and the dipole couplings are re-introduced in the mixing period by spinning off the Magic Angle. The dependency of the exchange rates on the mixing time and the spinning angle is investigated. The influence of strong spin-locking during mixing is discussed, and shown in the spin-1/2 case to remove the dependence on chemical shift offset effects. For quadrupolar spins, the experiment yields information on the relative tensor orientations of the coupled quadrupoles. Applications to crystalline sodium aluminum diphosphate, sodium sulphite, and potassium borate glasses are shown. |
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Keywords: | 2D-NMR Off-angle spinning Spin-lock Through-space magnetization exchange Quadrupolar nuclei 23Na 11B 31P |
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