Dynamic nuclear polarization enhancement of protons and vanadium‐51 in the presence of pH‐dependent vanadyl radicals |
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| Authors: | Angel J. Perez Linde Diego Carnevale Pascal Miéville Andrzej Sienkiewicz Geoffrey Bodenhausen |
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| Affiliation: | 1. Institut des Sciences et Ingénierie Chimiques (ISIC), Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;2. Laboratory of Nanostructured and Complex Matter Physics (LPMC), Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH‐1015 Lausanne, Switzerland;3. Département de Chimie, école Normale Supérieure‐PSL Research University, Paris, France;4. Sorbonne Universités, UPMC Univ Paris 06, LBM, Paris, France;5. UMR 7203 LBM, CNRS, Paris, France |
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| Abstract: | We report applications of dynamic nuclear polarization to enhance proton and vanadium‐51 polarization of vanadyl sulfate samples doped with TOTAPOL under magic angle spinning conditions. The electron paramagnetic resonance response stemming from the paramagnetic 51V species was monitored as a function of pH, which can be adjusted to improve the enhancement of the proton polarization. By means of cross‐polarization from the proton bath, 51V spins could be hyperpolarized. Enhancement factors, build‐up times, and longitudinal relaxation times T1(1H) and T1(51V) were investigated as a function of pH. Copyright © 2014 John Wiley & Sons, Ltd. |
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| Keywords: | NMR MAS vanadium‐51 DNP EPR |
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