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Electrochemical Overhauser dynamic nuclear polarization.

Mika Tamski1, Jonas Milani, Christophe Roussel

  • 1Institut de physique, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland. jonas.milani@epfl.ch.

Physical Chemistry Chemical Physics : PCCP
|August 9, 2020
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Summary
This summary is machine-generated.

This study introduces electrochemistry for Dynamic Nuclear Polarization (DNP), enhancing Nuclear Magnetic Resonance (NMR) sensitivity. It uses electrochemically generated radicals to boost NMR signals, offering a novel and controllable hyperpolarization method.

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Area of Science:

  • Chemistry
  • Spectroscopy
  • Electrochemistry

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy has limited sensitivity due to low nuclear spin polarization.
  • Dynamic Nuclear Polarization (DNP) enhances NMR signal intensity by transferring electron spin polarization to nuclei.
  • Conventional DNP methods rely on adding external radical agents like TEMPOL or trityl.

Purpose of the Study:

  • To investigate the potential of electrochemically generated radicals for DNP.
  • To demonstrate proof of principle for in situ DNP using electrochemistry.
  • To explore electrochemistry as a novel source of hyperpolarization for NMR.

Main Methods:

  • In situ Dynamic Nuclear Polarization (DNP) experiment.
  • Low magnetic field solution-phase NMR.
  • Electrochemical generation of methyl viologen cation radicals as the polarizing agent.

Main Results:

  • Successfully demonstrated in situ DNP using electrochemically generated radicals.
  • Showcased the feasibility of using methyl viologen cation radicals for hyperpolarization.
  • Established electrochemistry as a viable method for generating DNP radicals.

Conclusions:

  • Electrochemical generation of radicals offers a promising new approach for DNP.
  • This method allows for tunable radical concentration and potential removal, improving hyperpolarization.
  • Electrochemistry provides an exciting prospect for advancing DNP techniques and NMR sensitivity.