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Issue 17, 2015
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A high saturation factor in Overhauser DNP with nitroxide derivatives: the role of 14N nuclear spin relaxation

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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.

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

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Publication details

The article was received on 13 Feb 2015, accepted on 30 Mar 2015 and first published on 30 Mar 2015


Article type: Communication
DOI: 10.1039/C5CP00935A
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Citation: Phys. Chem. Chem. Phys., 2015,17, 11144-11149
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    A high saturation factor in Overhauser DNP with nitroxide derivatives: the role of 14N nuclear spin relaxation

    N. Enkin, G. Liu, M. D. C. Gimenez-Lopez, K. Porfyrakis, I. Tkach and M. Bennati, Phys. Chem. Chem. Phys., 2015, 17, 11144
    DOI: 10.1039/C5CP00935A

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