The distance between g-tensors of nitroxide biradicals governs MAS-DNP performance: The case of the bTurea family.

ABSTRACT: Bis-nitroxide radicals are common polarizing agents (PA), used to enhance the sensitivity of solid-state NMR experiments via Magic Angle Spinning Dynamic Nuclear Polarization (MAS-DNP). These biradicals can increase the proton spin polarization through the Cross-Effect (CE) mechanism, which requires PAs with at least two unpaired electrons. The relative orientation of the bis-nitroxide moieties is critical to ensure efficient polarization transfer. Recently, we have defined a new quantity, the distance between g-tensors, that correlates the relative orientation of the nitroxides with the ability to polarize the surrounding nuclei. Here we analyse experimentally and theoretically a series of biradicals belonging to the bTurea family, namely bcTol, AMUPol and bcTol-M. They differ by the degr

SUBMITTER: Mentink-Vigier F 

PROVIDER: S-EPMC8316413 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature