A high saturation factor in Overhauser DNP with nitroxide derivatives: the role of N-14 nuclear spin relaxation
2015 | journal article. A publication with affiliation to the University of Göttingen.
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A high saturation factor in Overhauser DNP with nitroxide derivatives: the role of N-14 nuclear spin relaxation
Enkin, N.; Liu, G.; Gimenez-Lopez, M. del C.; Porfyrakis, K.; Tkach, I. & Bennati, M. (2015)
Physical Chemistry Chemical Physics, 17(17) pp. 11144-11149. DOI: https://doi.org/10.1039/c5cp00935a
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Details
- Authors
- Enkin, Nikolay; Liu, Guoquan; Gimenez-Lopez, Maria del Carmen; Porfyrakis, Kyriakos; Tkach, Igor; Bennati, Marina
- 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 N-14 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 (N-14) relaxation in the nitroxide radical. The observation has a direct impact on the choice of optimum DNP polarizers in liquids.
- Issue Date
- 2015
- Status
- published
- Publisher
- Royal Soc Chemistry
- Journal
- Physical Chemistry Chemical Physics
- ISSN
- 1463-9084; 1463-9076
