Novel PTM–TEMPO Biradical for Fast Dissolution Dynamic Nuclear Polarization
Organic Letters2014Vol. 16(20), pp. 5402–5405
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J. L. Muñoz-Gómez, Ildefonso Marín-Montesinos, Vega Lloveras, Miquel Pons, J. Vidal-Gancedo, Jaume Veciana
Abstract
The synthesis and characterization of a novel trityl-TEMPO biradical and the investigation of its properties as Dynamic Nuclear Polarization (DNP) polarizing agent are reported. Comparison with a structurally related monoradical (PTM-TEMPE) or mixtures of the two monoradical components reveals that the biradical has a much higher polarization efficiency and a faster polarization buildup. This offers the possibility of faster recycling further contributing to its efficiency as a polarizing agent.
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