title: Properties of dinitroxides for use in dynamic nuclear polarization (DNP).
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 (omega(H)/omega(D)) influences the efficiency of the cross effect (CE) mechanism, thus the Ree distance between the unpaired electrons must be adapted to omega(H).
authors.affiliation: SREP LCP UMR 6264, CNRS et Universités d'Aix Marseille 1, 2 et 3, Faculté de St Jérôme case 521, 13013 Marseille, France.
authors.forename: Cédric
authors.initials: C
authors.lastname: Ysacco
authors.forename: Egon
authors.initials: E
authors.lastname: Rizzato
authors.forename: Marie-Alice
authors.initials: MA
authors.lastname: Virolleaud
authors.forename: Hakim
authors.initials: H
authors.lastname: Karoui
authors.forename: Antal
authors.initials: A
authors.lastname: Rockenbauer
authors.forename: François
authors.initials: F
authors.lastname: Le Moigne
authors.forename: Didier
authors.initials: D
authors.lastname: Siri
authors.forename: Olivier
authors.initials: O
authors.lastname: Ouari
authors.forename: Robert G
authors.initials: RG
authors.lastname: Griffin
authors.forename: Paul
authors.initials: P
authors.lastname: Tordo