Comparative Study of the Magnetic Field Dependent Signal Enhancement in Solid-State Dynamic Nuclear Polarization Experiments. Bothe, S., Hoffmann, M. M, Gutmann, T., & Buntkowsky, G. The Journal of Physical Chemistry C, 121(48):27089–27097, December, 2017. doi abstract bibtex A detailed study of the magnetic field dependent signal enhancement in solid-state dynamic nuclear polarization (DNP) experiments is presented for a specific sample consisting of AMUPol dissolved in the nonionic surfactant C 10 E 6 . C 10 E 6 displays a superposition of " direct " and " indirect channel " resonances in 13 C MAS DNP NMR spectra. The shapes of the DNP enhancement profiles are essentially identical for the 1 H MAS, 1 H → 13 C CP MAS, and 13 C MAS indirect channel signals, which confirms that the same polarization transfer process from electron to proton is responsible for the obtained enhancements of these experiments. The shape of the DNP enhancement profiles of 1 H and of 13 C direct channel resonances reveals that the cross effect is the dominant polarization transfer mechanism for the studied sample. The magnitudes of the 13 C MAS DNP enhancement profiles for 1 H → 13 C CP MAS, direct and indirect channel signals were found to be not uniform. For 1 H → 13 C CP MAS and the indirect channel signals, this observation is related to relaxation effects of the methyl group carbon. For the 13 C MAS direct channel resonances, differences in magnitudes are discussed in terms of preferential structural orientation of the polar ethylene oxide headgroup of C 10 E 6 toward the AMUPol radical.
@article{Bothe,
title = {Comparative {Study} of the {Magnetic} {Field} {Dependent} {Signal} {Enhancement} in {Solid}-{State} {Dynamic} {Nuclear} {Polarization} {Experiments}},
volume = {121},
issn = {1932-7447},
doi = {10.1021/acs.jpcc.7b07967},
abstract = {A detailed study of the magnetic field dependent signal enhancement in solid-state dynamic nuclear polarization (DNP) experiments is presented for a specific sample consisting of AMUPol dissolved in the nonionic surfactant C 10 E 6 . C 10 E 6 displays a superposition of " direct " and " indirect channel " resonances in 13 C MAS DNP NMR spectra. The shapes of the DNP enhancement profiles are essentially identical for the 1 H MAS, 1 H → 13 C CP MAS, and 13 C MAS indirect channel signals, which confirms that the same polarization transfer process from electron to proton is responsible for the obtained enhancements of these experiments. The shape of the DNP enhancement profiles of 1 H and of 13 C direct channel resonances reveals that the cross effect is the dominant polarization transfer mechanism for the studied sample. The magnitudes of the 13 C MAS DNP enhancement profiles for 1 H → 13 C CP MAS, direct and indirect channel signals were found to be not uniform. For 1 H → 13 C CP MAS and the indirect channel signals, this observation is related to relaxation effects of the methyl group carbon. For the 13 C MAS direct channel resonances, differences in magnitudes are discussed in terms of preferential structural orientation of the polar ethylene oxide headgroup of C 10 E 6 toward the AMUPol radical.},
number = {48},
journal = {The Journal of Physical Chemistry C},
author = {Bothe, Sarah and Hoffmann, Markus M and Gutmann, Torsten and Buntkowsky, Gerd},
month = dec,
year = {2017},
pages = {27089--27097},
}
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