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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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Publication details

The article was received on 06 Sep 2017, accepted on 07 Nov 2017 and first published on 10 Nov 2017


Article type: Paper
DOI: 10.1039/C7CP06073D
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
  • Open access: Creative Commons BY license
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    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, Advance Article , DOI: 10.1039/C7CP06073D

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