Dynamic Nuclear Polarization with a Water-Soluble Rigid Biradical
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A new biradical polarizing agent, bTbtk-py, for dynamic nuclear polarization (DNP) experiments in aqueous media is reported. The synthesis is discussed in light of the requirements of the optimum, theoretical, biradical system. To date, the DNP NMR signal enhancement resulting from bTbtk-py is the largest of any biradical in the ideal glycerol/water solvent matrix, ε = 230. EPR and X-ray crystallography are used to characterize the molecule and suggest approaches for further optimizing the biradical distance and relative orientation.
Date issued
2012-02Department
Massachusetts Institute of Technology. Department of Chemistry; Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)Journal
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Citation
Kiesewetter, Matthew K., Bjorn Corzilius, Albert A. Smith, Robert G. Griffin, and Timothy M. Swager. “Dynamic Nuclear Polarization with a Water-Soluble Rigid Biradical.” Journal of the American Chemical Society 134, no. 10 (March 14, 2012): 4537-4540.
Version: Author's final manuscript
ISSN
0002-7863
1520-5126