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Keywords:

  • dinitroxides;
  • dynamic nuclear polarization (DNP);
  • polarizing agents;
  • solid-state NMR spectroscopy;
  • synthesis (org.)
Thumbnail image of graphical abstract

Well polarized: Two new polarizing agents PyPol and AMUPol soluble in glycerol/water mixtures are used for dynamic nuclear polarization (DNP) NMR spectroscopy. The enhancement factors (ε) are about 3.5 to 4 times larger than for the established agent TOTAPOL at 263 and 395 GHz. For AMUPol, the temperature dependence of ε allows DNP experiments to be performed at temperatures significantly higher than for typical high-field DNP NMR experiments.