Properties of dinitroxides for use in dynamic nuclear polarization (DNP)

Cédric Ysacco; Egon Rizzato; Marie-Alice Virolleaud; Hakim Karoui; Antal Rockenbauer; François Le Moigne; Didier Siri; Olivier Ouari; Robert G. Griffin; Paul Tordo

doi:10.1039/C002591G

Properties of dinitroxides for use in dynamic nuclear polarization (DNP)†

Cédric Ysacco,^a Egon Rizzato,^a Marie-Alice Virolleaud,^a Hakim Karoui,^a Antal Rockenbauer,^b François Le Moigne,^a Didier Siri,^a Olivier Ouari,^a Robert G. Griffin^c and Paul Tordo*^a

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^a SREP LCP UMR 6264, CNRS et Universités d’Aix Marseille 1, 2 et 3, Faculté de St Jérôme case 521, 13013 Marseille, France
E-mail: paul.tordo@univ-provence.fr
Fax: +33 (0)491 28 87 58
Tel: +33 (0)491 28 84 86

^b Chemical Research Center, Institute for Structural Chemistry, PO box 435, 1525 Budapest, Hungary

^c Francis Bitter Magnet Laboratory and Dpt of Chemistry, Massachusetts Institute of Technology, Cambridge, USA

Abstract

We have investigated the properties of a series of dinitroxides as polarizing agents for SS NMR/DNP applications. Our results clearly establish that an orthogonal relative orientation of electron g tensors is a crucial requirement to obtain high enhancement DNP factors. Moreover, the ratio of the proton Larmor frequency over the e⁻–e⁻ dipolar coupling (ω_H/ω_D) influences the efficiency of the cross effect (CE) mechanism, thus the 〈Ree〉 distance between the unpaired electrons must be adapted to ω_H.

This article is part of the themed collection: High field dynamic nuclear polarization – The renaissance

Physical Chemistry Chemical Physics

Properties of dinitroxides for use in dynamic nuclear polarization (DNP)†

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Properties of dinitroxides for use in dynamic nuclear polarization (DNP)

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