Pulsed Dynamic Nuclear Polarization with Trityl Radicals
Author(s)Mathies, Guinevere; Jain, Sheetal A; Reese, Marcel; Griffin, Robert Guy
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Continuous-wave (CW) dynamic nuclear polarization (DNP) is now established as a method of choice to enhance the sensitivity in a variety of NMR experiments. Nevertheless, there remains a need for the development of more efficient methods to transfer polarization from electrons to nuclei. Of particular interest are pulsed DNP methods because they enable a rapid and efficient polarization transfer that, in contrast with CW DNP methods, is not attenuated at high magnetic fields. Here we report nuclear spin orientation via electron spin-locking (NOVEL) experiments using the polarizing agent trityl OX063 in glycerol/water at a temperature of 80 K and a magnetic field of 0.34 T. [superscript 1]H NMR signal enhancements up to 430 are observed, and the buildup of the local polarization occurs in a few hundred nanoseconds. Thus, NOVEL can efficiently dynamically polarize [superscript 1]H atoms in a system that is of general interest to the solid-state DNP NMR community. This is a first, important step toward the general application of pulsed DNP at higher fields.
DepartmentFrancis Bitter National Magnet Laboratory; Massachusetts Institute of Technology. Department of Chemistry
The Journal of Physical Chemistry Letters
American Chemical Society (ACS)
Mathies, Guinevere et al. “Pulsed Dynamic Nuclear Polarization with Trityl Radicals.” The Journal of Physical Chemistry Letters 7.1 (2016): 111–116.
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