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Dynamic nuclear polarization enhancement of protons and vanadium‐51 in the presence of pH‐dependent vanadyl radicals
Author(s) -
Perez Linde Angel J.,
Carnevale Diego,
Miéville Pascal,
Sienkiewicz Andrzej,
Bodenhausen Geoffrey
Publication year - 2015
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4138
Subject(s) - chemistry , vanadium , polarization (electrochemistry) , proton , spins , paramagnetism , magic angle spinning , electron paramagnetic resonance , nuclear magnetic resonance , hyperpolarization (physics) , analytical chemistry (journal) , inorganic chemistry , nuclear magnetic resonance spectroscopy , condensed matter physics , nuclear physics , stereochemistry , physics , chromatography
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 51 V 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, 51 V spins could be hyperpolarized. Enhancement factors, build‐up times, and longitudinal relaxation times T 1 ( 1 H) and T 1 ( 51 V) were investigated as a function of pH. Copyright © 2014 John Wiley & Sons, Ltd.