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PRESTO polarization transfer to quadrupolar nuclei: implications for dynamic nuclear polarization

TitlePRESTO polarization transfer to quadrupolar nuclei: implications for dynamic nuclear polarization
Publication TypeJournal Article
Year of Publication2015
AuthorsPerras, FA, Kobayashi, T, Pruski, M
JournalPhysical Chemistry Chemical Physics
Volume17
Pagination22616-22622
Date Published09
Type of ArticleArticle
ISBN Number1463-9076
Accession NumberWOS:000360448300020
Keywordsangle-spinning nmr, coherence transfer, correlation, correlation spectroscopy, mas nmr, quantum cross-polarization, resolution heteronuclear, rotating solids, signal enhancement, solid-state nmr, spin-1/2 nuclei
Abstract

We show both experimentally and numerically on a series of model systems that in experiments involving transfer of magnetization from H-1 to the quadrupolar nuclei under magic-angle-spinning (MAS), the PRESTO technique consistently outperforms traditionally used cross polarization (CP), affording more quantitative intensities, improved lineshapes, better overall sensitivity, and straightforward optimization. This advantage derives from the fact that PRESTO circumvents the convoluted and uncooperative spin dynamics during the CP transfer under MAS, by replacing the spin-locking of quadrupolar nuclei with a single central transition selective 901 pulse and using a symmetry-based recoupling sequence in the H-1 channel. This is of particular importance in the context of dynamic nuclear polarization (DNP) NMR of quadrupolar nuclei, where the efficient transfer of enhanced H-1 polarization is desired to obtain the highest sensitivity.

DOI10.1039/c5cp04145g
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