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Title:	Polychlorinated trityl radicals for dynamic nuclear polarization: the role of chlorine nuclei
Author:	Paniagua, Juan Carlos; Mugnaini, Verónica; Gabellieri, Cristina; Feliz Rodenas, Miguel; Roques, Nans; Veciana, Jaume; Pons Vallès, Miquel
Other authors:	Universitat de Barcelona
Abstract:	Polychlorinated trityl radicals bearing carboxylate substituents are water soluble persistent radicals that can be used for dynamic nuclear polarization. In contrast to other trityl radicals, the polarization mechanism differs from the classical solid effect. DFT calculations performed to rationalize this behaviour support the hypothesis that polarization is transferred from the unpaired electron to chlorine nuclei and from these to carbon by spin diffusion. The marked differences observed between neutral and anionic forms of the radical will be discussed.
Subject(s):	-Ressonància magnètica nuclear -Camps magnètics -Polarització (Física nuclear) -Nanomedicina -Matèria condensada -Clor -Solubilitat -Aigua -Radicals (Química) -Nuclear magnetic resonance -Magnetic fields -Polarization (Nuclear physics) -Nanomedicine -Condensed matter -Chlorine -Solubility -Water -Radicals (Chemistry)
Rights:	(c) Paniagua, Juan Carlos et al., 2010
Document type:	Article Article - Accepted version
Published by:	Royal Society of Chemistry
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