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Issue 47, 2017
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Photo-induced radical polarization and liquid-state dynamic nuclear polarization using fullerene nitroxide derivatives

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Abstract

We report on radical polarization and optically-driven liquid DNP using nitroxide radicals functionalized by photoexcitable fullerene derivatives. Pulse laser excitation of the fullerene moiety leads to transient nitroxide radical polarization that is one order of magnitude larger than that at the Boltzmann equilibrium. The life time of the radical polarization increases with the size of the fullerene derivative and is correlated with the electronic spin-lattice relaxation time T1e. Overhauser NMR signal enhancements of toluene solvent protons were observed under steady-state illumination, which replaced microwave irradiation.

Graphical abstract: Photo-induced radical polarization and liquid-state dynamic nuclear polarization using fullerene nitroxide derivatives

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Article information


Submitted
06 Sep 2017
Accepted
07 Nov 2017
First published
10 Nov 2017

This article is Open Access

Phys. Chem. Chem. Phys., 2017,19, 31823-31829
Article type
Paper

Photo-induced radical polarization and liquid-state dynamic nuclear polarization using fullerene nitroxide derivatives

G. Liu, S. Liou, N. Enkin, I. Tkach and M. Bennati, Phys. Chem. Chem. Phys., 2017, 19, 31823
DOI: 10.1039/C7CP06073D

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