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Investigation of a C(sp2)-coupled nitronyl nitroxide diradical by electron paramagnetic resonance

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Abstract

A heteroatomic analog of 1,1,2,3,3-pentamethylenepropane, the diradical N-[bis(4,4,5,5-tetramethyl-3-oxide-1-oxyl-4,5-dihydro-1H-imidazol-2-yl)methylene]-2-methylpropane-2-amine oxide (1) with two C(sp2)-bonded nitronyl nitroxide fragments in magnetically concentrated (single crystal) and magnetically diluted (frozen solution) forms was studied by EPR spectroscopy. The longitudinal and transverse relaxation times of diradical 1 in the frozen solution were measured for the first time; a significant difference in the intramolecular exchange interaction was demonstrated for the cases of the single crystal and the frozen solution. The influence of solvation on the value of the intramolecular exchange interaction in this class of compounds was discussed.

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Funding

This work was financially supported by the Russian Science Foundation (Project No. 17-13-01412) in the matter of conducting research by EPR spectroscopy and analysis of the results. S. E. Tolstikov is grateful to the Russian Foundation for Basic Research for supporting synthetic research (Project No. 18-29-04002).

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Authors and Affiliations

  1. International Tomography Center, Siberian Branch of the Russian Academy of Sciences, 3a ul. Institutskaya, 630090, Novosibirsk, Russia

    A. A. Samsonenko, S. E. Tolstikov, V. I. Ovcharenko, M. V. Fedin & S. L. Veber

  2. Novosibirsk State University, 2 ul. Pirogova, 630090, Novosibirsk, Russia

    A. A. Samsonenko, M. V. Fedin & S. L. Veber

Authors
  1. A. A. Samsonenko
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  2. S. E. Tolstikov
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  3. V. I. Ovcharenko
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  4. M. V. Fedin
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  5. S. L. Veber
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Corresponding author

Correspondence to S. L. Veber.

Additional information

Dedicated to Academician of the Russian Academy of Sciences R. Z. Sagdeev on the occasion of his 80th birthday.

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2370–2374, December, 2021.

This paper does not contain descriptions of studies on animals or humans.

The authors declare no competing interests.

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Samsonenko, A.A., Tolstikov, S.E., Ovcharenko, V.I. et al. Investigation of a C(sp2)-coupled nitronyl nitroxide diradical by electron paramagnetic resonance. Russ Chem Bull 70, 2370–2374 (2021). https://doi.org/10.1007/s11172-021-3355-4

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  • DOI: https://doi.org/10.1007/s11172-021-3355-4

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