Efficient DNP at high fields and fast MAS with antenna-sensitized dinitroxides
Lorenzo Niccoli, Gilles Casano, Georges Menzildjian, Maxim Yulikov, Thomas Robinson, Salah-Eddine Akrial, Zhuoran Wang, Christian Reiter, Armin Purea, Didier Siri, Amrit Venkatesh, Lyndon Emsley, David Gajan, Moreno Lelli, Olivier Ouari, Anne Lesage
Abstract
H ESEEM measurements to probe solvent accessibility, supported by Molecular Dynamics simulations, and by experiments on deuterated samples. We find that the deuterated glycerol molecules in the matrix are located mainly in the second solvation shell of the NO bond, limiting access for protonated water molecules, and restricting spin diffusion pathways. This provides a rational understanding of why the dihydroxypropyl chains present in the best-performing structures are essential to deliver the polarization to the bulk solution.