High-field (13)c dynamic nuclear polarization with a radical mixture.

TitleHigh-field (13)c dynamic nuclear polarization with a radical mixture.
Publication TypeJournal Article
Year of Publication2013
AuthorsMichaelis, VK, Smith, AA, Corzilius, B\örn, Haze, O, Swager, TM, Griffin, RG
JournalJournal of the American Chemical Society
Date Publishedfeb
KeywordsHigh Field carbon 13 dynamic nuclear polarization

We report direct (13)C dynamic nuclear polarization at 5 T under magic-angle spinning (MAS) at 82 K using a mixture of monoradicals with narrow EPR linewidths. We show the importance of optimizing both EPR linewidth and electron relaxation times by studying direct DNP of (13)C using SA-BDPA and trityl radical, and achieve (13)C enhancements above 600. This new approach may be best suited for dissolution DNP and for studies of (1)H depleted biological and other nonprotonated solids.