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

Cédric Ysacco (1) , Egon Rizzato (1) , Marie-Alice Virolleaud (2) , Hakim Karoui (1) , Antal Rockenbauer (3) , François Le Moigne (1) , Didier Siri (1) , Olivier Ouari (4) , Robert G. Griffin , Paul Tordo (5)

1 ICR - Institut de Chimie Radicalaire
2 STeRéO
3 Chemical Research Center
4 LCP - Laboratoire Chimie Provence
5 CBRL - Chimie, biologie et radicaux libres - UMR 6517

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 \textless Ree \textgreater distance between the unpaired electrons must be adapted to omega(H).

Domaines: Chimie

Cédric Ysacco, Egon Rizzato, Marie-Alice Virolleaud, Hakim Karoui, Antal Rockenbauer, et al.. Properties of dinitroxides for use in dynamic nuclear polarization (DNP). Physical Chemistry Chemical Physics, 2010, 12 (22), pp.5841--5845. ⟨10.1039/c002591g⟩. ⟨hal-01460305⟩