Topical Developments in High-Field Dynamic Nuclear Polarization
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Vega_v15_131025.pdf
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6.9 MB
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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
Date Issued
February 2014
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
Abstract
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%.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1002/ijch.201300126
