期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 11, 期 9, 页码 3718-3723出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00830
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资金
- National Science Foundation [CHE 1505038]
- Binational Science Foundation [2014149]
Trityl-OX063 is a narrow-line, water-soluble, and biocompatible polarizing agent, widely used for dynamic nuclear polarization (DNP) amplified NMR of C-13, but not of the abundant H-1 nuclear spin, for which the ineffective solid effect (SE) is expected to be operational. Surprisingly, we observed a crossover from SE to thermal mixing (TM) DNP of H-1 with increasing Trityl-OX063 concentration at 7 T. We experimentally ascertained diagnostic signatures of TM-DNP that have only been theoretically predicted: (i) an electron paramagnetic resonance (EPR) spectrum that maintains an asymmetrically broadened EPR line from strong e-e couplings and (ii) hyperpolarization, i.e., cooling of select electron-spin populations, manifested in a characteristic pump-probe electron double-resonance spectrum under DNP conditions. Low microwave power requirements, high polarization transfer rates, and efficient DNP at high magnetic fields are the key benefits of TM-DNP.
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