Herein, we report the synthesis and the study of a novel mixed biradical with BDPA and TEMPO radical units that are covalently bound by an ester group (BDPAesterTEMPO) as a polarizing agent for fast dissolution DNP. The biradical exhibits an extremely high DNP NMR enhancement of >50 000 times, which constitutes one of the largest signal enhancements observed so far, to the best of our knowledge.
L. F. Pinto, I. Marín-Montesinos, V. Lloveras, J. L. Muñoz-Gómez, M. Pons, J. Veciana and J. Vidal-Gancedo, Chem. Commun., 2017, 53, 3757 DOI: 10.1039/C7CC00635G
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