Sucharita Mandal and Snorri Th. Sigurdsson
Chem. Commun., 2020,56, 13121-13124
DOI:
10.1039/D0CC04920D,
Communication
1,3-Bis(diphenylene)-2-phenylallyl (BDPA) radicals are promising polarizing agents for increasing the sensitivity of NMR spectroscopy through dynamic nuclear polarization (DNP), but have low persistence and solubility in aqueous media. New tetraalkyl/aryl-ammonium derivatives of BDPA are soluble in polar solvents and are highly persistent, with 5–20-fold lower initial rates of degradation than BDPA.
