Dinitroxides for Solid State Dynamic Nuclear Polarization

Cédric Ysacco (1) , Hakim Karoui (1) , Gilles Casano (1) , François Le Moigne (1) , Sébastien Combes (1) , Antal Rockenbauer (2) , Melanie Rosay (3) , Werner Maas (3) , Olivier Ouari (1) , Paul Tordo (1)

1 ICR - Institut de Chimie Radicalaire
2 Institute of Materials and Environmental Chemistry [Budapest]
3 Bruker BioSpin [Billerica, MA]

We have prepared a series of dinitroxides and we investigated their properties as polarizing agents for solid-state nuclear magnetic resonance/dynamic nuclear polarization applications at 100 K, 9.34 T (263 GHz electron paramagnetic resonance and 400 MHz 1 H nuclear magnetic resonance). Our results show that a rigid structure with an orthogonal relative orientation of electron g tensors and the appropriate orientation of the two N O bonds are required to obtain maximum polarization enhancements. In addition, with dinitroxides exhibiting a long T1e, the saturation of the irradiated electron spin packet is favored leading to more efficient dynamic nuclear polarization.

Domaines: Chimie

Cédric Ysacco, Hakim Karoui, Gilles Casano, François Le Moigne, Sébastien Combes, et al.. Dinitroxides for Solid State Dynamic Nuclear Polarization. Applied Magnetic Resonance, 2012, 43 (1-2), pp.251 - 261. ⟨10.1007/s00723-012-0356-3⟩. ⟨hal-01425037⟩