Properties of dinitroxides for use in dynamic nuclear polarization (DNP).
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).
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SREP LCP UMR 6264, CNRS et Universités d'Aix Marseille 1, 2 et 3, Faculté de St Jérôme case 521, 13013 Marseille, France.
Rizzato
Egon
E
Virolleaud
Marie-Alice
MA
Karoui
Hakim
H
Rockenbauer
Antal
A
Le Moigne
François
F
Siri
Didier
D
Ouari
Olivier
O
Griffin
Robert G
RG
Tordo
Paul
P