Abstract
A new polarizing agent with superior performance in dynamic nuclear polarization experiments is introduced, and utilizes two TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) moieties connected through a rigid spiro tether (see structure). The observed NMR signal intensities were enhanced by a factor of 1.4 compared to those of TOTAPOL, a previously described TEMPO-based biradical with a flexible tether. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.
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Matsuki, Y., Maly, T., Ouari, O., Karoui, H., Le Moigne, F., Rizzato, E., … Griffin, R. G. (2009). Dynamic nuclear polarization with a rigid biradical. Angewandte Chemie - International Edition, 48(27), 4996–5000. https://doi.org/10.1002/anie.200805940
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