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

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

Enkin, Nikolay, Liu, Guoquan, Gimenez-Lopez, Maria del Carmen, Porfyrakis, Kyriakos ORCID: 0000-0003-1364-0261, Tkach, Igor and Bennati, Marina (2015) A high saturation factor in overhauser DNP with nitroxide derivatives: the role of 14N nuclear spin relaxation. Physical Chemistry Chemical Physics, 17 (17). pp. 11144-11149. ISSN 1463-9076 (Print), 1463-9084 (Online) (doi:https://doi.org/10.1039/C5CP00935A)

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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.

Item Type: Article
Uncontrolled Keywords: overhauser DNP, spin relaxation, endohedral fullerenes
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > School of Engineering (ENN)
Last Modified: 19 Sep 2020 00:20
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: None
URI: http://gala.gre.ac.uk/id/eprint/27509

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