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

Enkin, N., Liu, G., Gimenez-Lopez, M. D., Porfyrakis, K., Tkach, I., & 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(17), 11144-11149. doi:10.1039/C5CP00935a.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-C771-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-0E1D-D
Genre: Journal Article

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 Creators:
Enkin, N.1, Author              
Liu, G.1, Author              
Gimenez-Lopez, M. D., Author
Porfyrakis, K., Author
Tkach, I.2, Author              
Bennati, M.2, Author              
Affiliations:
1Research Group of Electron Paramagnetic Resonance, MPI for Biophysical Chemistry, Max Planck Society, ou_578606              
2Research Group of Electron Paramagnetic Resonance, MPI for biophysical chemistry, Max Planck Society, ou_578606              

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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 (14)N 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 ((14)N) relaxation in the nitroxide radical. The observation has a direct impact on the choice of optimum DNP polarizers in liquids.

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Language(s): eng - English
 Dates: 2015-03-302015-04-21
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1039/C5CP00935a
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Title: Physical Chemistry Chemical Physics
Source Genre: Journal
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Pages: - Volume / Issue: 17 (17) Sequence Number: - Start / End Page: 11144 - 11149 Identifier: -