Optimized polarization build-up times in dissolution DNP-NMR using a benzyl amino derivative of BDPA

J. L. Muñoz-Gómez, E. Monteagudo, V. Lloveras, T. Parella, J. Veciana, J. Vidal-Gancedo

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

© The Royal Society of Chemistry 2016. The synthesis of two novel BDPA-like radicals, a benzyl amino (BAm-BDPA, 7) and a cyano (CN-BDPA, 5) derivative, is reported and their behaviour as polarizing agents for fast dissolution Dynamic Nuclear Polarization (DNP) is evaluated. The radical 7 is a promising candidate for DNP studies since it is soluble in neat [1-13C]pyruvic acid (PA), and therefore the use of an additional glassing agent for sample homogeneity is avoided. In addition, a 60 mM sample of 7 offers optimum 13C NMR signal enhancements using fairly short polarization times (about 1800 s). It is shown that DNP-NMR measurements using 7 can be performed much more efficiently in terms of the signal enhancement per polarization build-up time unit than when using the reference OX63 or BDPA radicals. These enhanced features are translated to a substantial reduction of polarization times that represents an optimum temporary use of the DNP polarizer and allow economized liquid helium consumption.
Original languageEnglish
Pages (from-to)27077-27082
JournalRSC Advances
Volume6
Issue number32
DOIs
Publication statusPublished - 1 Jan 2016

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