Polychlorinated trityl radicals for dynamic nuclear polarization: the role of chlorine nuclei

Literature Information

Publication Date 2010-05-10
DOI 10.1039/C003291N
Impact Factor 3.676
Authors

Juan Carlos Paniagua, Cristina Gabellieri, Miguel Feliz, Nans Roques


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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.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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