Radical-Induced Low-Field 1H Relaxation in Solid Pyruvic Acid Doped with Trityl-OX063

Jurkutat, Michael; Kouřilová, Hana; Peat, David; Kouřil, Karel; Khan, Alixander S.; Horsewill, Anthony J.; MacDonald, James F.; Owers-Bradley, John; Meier, Benno

Abstract

In dynamic nuclear polarization (DNP), radicals such as trityl provide a source for high nuclear spin polarization. Conversely, during the low-field transfer of hyperpolarized solids, the radicals’ dipolar or Non-Zeeman reservoir may act as a powerful nuclear polarization sink. Here, we report the low-temperature proton spin relaxation in pyruvic acid doped with trityl, for fields from 5 mT to 2 T. We estimate the heat capacity of the radical Non-Zeeman reservoir experimentally and show that a recent formalism by Wenckebach yields a parameter-free, yet quantitative model for the entire field range.

Citation

Jurkutat, M., Kouřilová, H., Peat, D., Kouřil, K., Khan, A. S., Horsewill, A. J., …Meier, B. (2022). Radical-Induced Low-Field 1H Relaxation in Solid Pyruvic Acid Doped with Trityl-OX063. Journal of Physical Chemistry Letters, 13(44), 10370-10376. https://doi.org/10.1021/acs.jpclett.2c02357

• Journal Article Type: Article
• Acceptance Date: Sep 30, 2022
• Online Publication Date: Oct 31, 2022
• Publication Date: Nov 10, 2022
• Deposit Date: Dec 15, 2022
• Publicly Available Date: Dec 15, 2022
• Journal: Journal of Physical Chemistry Letters
• Electronic ISSN: 1948-7185
• Peer Reviewed: Peer Reviewed
• Volume: 13
• Issue: 44
• Pages: 10370-10376
• DOI: https://doi.org/10.1021/acs.jpclett.2c02357
• Keywords: General Materials Science, Physical and Theoretical Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/13738748
• Publisher URL: https://pubs.acs.org/doi/10.1021/acs.jpclett.2c02357