We report a large variation in liquid DNP performance of up to a factor of about five in coupling factors among organic radicals used commonly as polarizing agents. A comparative...
Large 31P-NMR enhancements are observed with DNP in PPh3 doped with BDPA radical, while they are reduced when a nitroxide radical or triphenylphosphine-oxide are used instead. This is due to different non-covalent radical/target molecule interactions.
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