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  4. Light-Induced <sup>1</sup>H NMR Hyperpolarization in Solids at 9.4 and 21.1 T
 
research article

Light-Induced 1H NMR Hyperpolarization in Solids at 9.4 and 21.1 T

De Biasi, Federico  
•
Karthikeyan, Ganesan
•
Visegrádi, Máté  
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July 24, 2024
Journal of the American Chemical Society

The inherently low sensitivity of nuclear magnetic resonance (NMR) spectroscopy is the major limiting factor for its application to elucidate structure and dynamics in solids. In the solid state, nuclear spin hyperpolarization methods based on microwave-induced dynamic nuclear polarization (DNP) provide a versatile platform to enhance the bulk NMR signal of many different sample formulations, leading to significant sensitivity improvements. Here we show that 1H NMR hyperpolarization can also be generated in solids at high magnetic fields by optical irradiation of the sample. We achieved this by exploiting a donor-chromophore-acceptor molecule with an excited state electron-electron interaction similar to the nuclear Larmor frequency, enabling solid-state 1H photochemically induced DNP (photo-CIDNP) at high magnetic fields. Through hyperpolarization relay, we obtained bulk NMR signal enhancements ϵH by factors of ∼100 at both 9.4 and 21.1 T for the 1H signal of o-terphenyl in magic angle spinning (MAS) NMR experiments at 100 K. These findings open a pathway toward a general light-induced hyperpolarization approach for dye-sensitized high-field NMR in solids.

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Type
research article
DOI
10.1021/jacs.4c06151
Scopus ID

2-s2.0-85199474552

PubMed ID

39007869

Author(s)
De Biasi, Federico  

École Polytechnique Fédérale de Lausanne

Karthikeyan, Ganesan

Institut de Chimie Radicalaire

Visegrádi, Máté  

École Polytechnique Fédérale de Lausanne

Levien, Marcel  

École Polytechnique Fédérale de Lausanne

Hope, Michael A.  

École Polytechnique Fédérale de Lausanne

Brown, Paige J.

Northwestern University

Wasielewski, Michael R.

Northwestern University

Ouari, Olivier

Institut de Chimie Radicalaire

Emsley, Lyndon  

École Polytechnique Fédérale de Lausanne

Date Issued

2024-07-24

Published in
Journal of the American Chemical Society
Volume

146

Issue

29

Start page

19667

End page

19672

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LRM  
FunderFunding(s)Grant NumberGrant URL

Swiss National Science Foundation

200020_212046

European Union’s Horizon 2020 research and innovation programme

101008500

U.S. National Science Foundation

CHE-2154627

Available on Infoscience
January 24, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/243352
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