Magnetic Resonance
Magnetic Resonance
MR
Articles | Volume 1, issue 2
Articles | Volume 1, issue 2
https://doi.org/10.5194/mr-1-175-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/mr-1-175-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 1, issue 2
Research article
 | 
07 Aug 2020
Research article |  | 07 Aug 2020

Geminal parahydrogen-induced polarization: accumulating long-lived singlet order on methylene proton pairs

Laurynas Dagys, Barbara Ripka, Markus Leutzsch, Gamal A. I. Moustafa, James Eills, Johannes F. P. Colell, and Malcolm H. Levitt

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Cited articles

Adams, R. W., Aguilar, J. A., Atkinson, K. D., Cowley, M. J., Elliott, P. I. P., Duckett, S. B., Green, G. G. R., Khazal, I. G., Lopez-Serrano, J., and Williamson, D. C.: Reversible Interactions with Para-Hydrogen Enhance NMR Sensitivity by Polarization Transfer, Science, 323, 1708–1711, 2009. a, b
Ardenkjaer-Larsen, J. H., Fridlund, B., Gram, A., Hansson, G., Hansson, L., Lerche, M. H., Servin, R., Thaning, M., and Golman, K.: Increase in Signal-to-Noise Ratio of >10 000 Times in Liquid-State NMR, P. Natl. Acad. Sci. USA, 100, 10158–10163, 2003. a
Barskiy, D. A., Knecht, S., Yurkovskaya, A. V., and Ivanov, K. L.: SABRE: Chemical Kinetics and Spin Dynamics of the Formation of Hyperpolarization, Prog. Nucl. Mag. Res. Sp., 114–115, 33–70, 2019. a
Bengs, C. and Levitt, M. H.: SpinDynamica: Symbolic and Numerical Magnetic Resonance in a Mathematica Environment, Magn. Reson. Chem., 56, 374–414, 2018. a, b
Bowers, C. R. and Weitekamp, D. P.: Parahydrogen and Synthesis Allow Dramatically Enhanced Nuclear Alignment, J. Am. Chem. Soc., 109, 5541–5542, 1987. a, b, c, d
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We explored hydrogenation reaction with a para-spin isomer of a hydrogen molecule as a source of nuclear singlet state. As a product of this reaction, the state was populated between two protons of the methylene group. We have shown that, utilizing long-lived properties of such a nuclear spin state, a high nuclear spin polarization can be accumulated. To explain this effect we have given a kinetic model which could be potentially applied for similar schemes involving spin dynamics in chemistry.
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