mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-153Research ArticleСтатьиTEMPOL as a polarizing agent for dynamic nuclear polarization of aqueous solutionsGafurovM. R.

Kremlevskaya, 18, Kazan 420008

Kazan Federal University, Institute of PhysicsRussian Federation20131901202415113103 (11 pp.)Copyright © Gafurov M.R., 20242024Gafurov M.R.Gafurov M.R.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/153

High-resolution proton NMR (400 MHz) and multifrequency EPR (9 - 260 GHz) characterization of aqueous solutions of the nitroxyl radical TEMPOL in the temperature range (10 - 40) °C is performed for the liquid-state DNP. Characteristic features of the in-situ DNP observations at high frequencies are presented. Optimal conditions (concentration, temperature, position of the microwave pumping, repetition/build-up time for the DNP experiments) are extracted. The results are compared with the DNP experiments, molecular dynamic calculations, saturation models, and classical models of translational and rotational diffusion. Perspectives for using TEMPOL as polarizing agent in even higher magnetic fields are discussed.

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The authors declare that there are no conflicts of interest present.