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  Nitroxide derivatives for dynamic nuclear polarization in liquids: The role of rotational diffusion.

Levien, M., Hiller, M., Tkach, I., Bennati, M., & Orlando, T. (2020). Nitroxide derivatives for dynamic nuclear polarization in liquids: The role of rotational diffusion. The Journal of Physical Chemistry Letters, 11(5), 1629-1635. doi:10.1021/acs.jpclett.0c00270.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-9999-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-A1EC-A
Genre: Journal Article

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 Creators:
Levien, M.1, Author              
Hiller, M.1, Author              
Tkach, I.1, Author              
Bennati, M.1, Author              
Orlando, T.1, Author              
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1Research Group of Electron Paramagnetic Resonance, MPI for Biophysical Chemistry, Max Planck Society, ou_578606              

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 Abstract: Polarization transfer efficiency in liquid-state dynamic nuclear polarization (DNP) depends on the interaction between polarizing agents (PAs) and target nuclei modulated by molecular motions. Hereby, we show how translational and rotational diffusion differently affect the DNP efficiency. These contributions were disentangled by measuring 1H-DNP enhancements of toluene and chloroform doped with nitroxide derivatives at 0.34 T as a function of either the temperature or the size of the PA. The results were employed to analyse 13C-DNP data at higher fields, where the polarization transfer is also driven by the Fermi contact interaction. In this case, bulky nitroxide PAs perform better than the small TEMPONE radical due to structural fluctuations of the ring conformation. These findings will help in designing PAs with features specifically optimized for liquid state DNP at various fields.

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Language(s): eng - English
 Dates: 2020-01-312020-03-05
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.jpclett.0c00270
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Title: The Journal of Physical Chemistry Letters
Source Genre: Journal
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Pages: - Volume / Issue: 11 (5) Sequence Number: - Start / End Page: 1629 - 1635 Identifier: -