Topical Developments in High-Field Dynamic Nuclear Polarization
Author(s)
Michaelis, Vladimir K.; Ong, Ta-Chung; Kiesewetter, Matthew K.; Frantz, Derik K.; Ravera, Enrico; Luchinat, Claudio; Walish, Joseph John; Griffin, Robert Guy; Swager, Timothy M; ... Show more Show less
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We report our recent efforts directed at improving high-field dynamic nuclear polarization (DNP) experiments. We investigated a series of thiourea nitroxide radicals and the associated DNP enhancements ranging from ε=25 to 82, which demonstrate the impact of molecular structure on performance. We directly polarized low-gamma nuclei, including [superscript 13]C, [superscript 2]H, and [superscript 17]O, by the cross effect mechanism using trityl radicals as a polarization agent. We discuss a variety of sample preparation techniques for DNP with emphasis on the benefits of methods that do not use a glass-forming cryoprotecting matrix. Lastly, we describe a corrugated waveguide for use in a 700 MHz/460 GHz DNP system that improves microwave delivery and increases enhancements up to 50%.
Date issued
2014-02Department
Massachusetts Institute of Technology. Department of Chemistry; Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)Journal
Israel Journal of Chemistry
Publisher
Wiley Blackwell
Citation
Michaelis, Vladimir K., Ta-Chung Ong, Matthew K. Kiesewetter, Derik K. Frantz, Joseph J. Walish, Enrico Ravera, Claudio Luchinat, Timothy M. Swager, and Robert G. Griffin. “Topical Developments in High-Field Dynamic Nuclear Polarization.” Isr. J. Chem. 54, no. 1–2 (February 2014): 207–221.
Version: Author's final manuscript
ISSN
00212148
1869-5868