A high saturation factor in Overhauser DNP with nitroxide derivatives: the role of 14N nuclear spin relaxation

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URI: http://hdl.handle.net/10347/32342
ISSN: 1463-9076
E-ISSN: 1463-9084
DOI: 10.1039/C5CP00935A

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2015-03-30

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Royal Society of Chemistry
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Abstract

Overhauser DNP enhancements of toluene were measured at a magnetic field of 0.35 Tesla in a series of chemically functionalized nitroxide radicals. We observe that the enhancements increase systematically with polarizer size and rotational correlation time. Examination of the saturation factor of 14N nitroxides by pulsed ELDOR spectroscopy led to a quantitative interpretation of the enhancements, for which the saturation factor increases up to almost unity due to enhanced nuclear (14N) relaxation in the nitroxide radical. The observation has a direct impact on the choice of optimum DNP polarizers in liquids.

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Nitroxide derivatives| Overhauser| Dynamic nuclear polarization

Bibliographic citation

Enkin, N., Liu, G., Gimenez-Lopez, M.C., Porfyrakis, K., Tkach, I., and Bennati, M. (2015). A high saturation factor in Overhauser DNP with nitroxide derivatives: the role of 14N nuclear spin relaxation. Physical Chemistry Chemical Physics, 17, 11144-11149

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Financial support from: the Max Planck Society and the COST Action TD1103 (European Network on Hyperpolarization), NE acknowledges the Graduate School for Neurosciences, Biophysics and Molecular Biosciences in Göttingen.

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Química Inorgánica