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Time-Resolved EPR Spectra of Photoexcited Copper Porphyrin

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Abstract

Photoinduced spin-polarized transient electron paramagnetic resonance (EPR) spectra of copper 5,10,15,20-tetrakis(3-pyridyl)porphyrin (3PyNCu) in the frozen solution have been observed in the X-band. The time evolution and the temperature dependence of the spectra have been studied. The effect of molecular oxygen in the frozen solution on the polarization pattern has also been examined. The magnetic resonance parameters of the ground state of 3PyNCu have been obtained by comparing the experimental continuous-wave and echo-detected EPR spectra with the numerical computations. The magnetic resonance parameters of the excited states and the photoinduced polarizations have been investigated by time-resolved EPR (TREPR) spectroscopy and numerical analysis. The experimental spectra have been considered as a sum of the polarized spectra of the ground and excited states. Our analysis confirmed that the TREPR spectra consisted of two main patterns: the enhanced signal from the ground state and the multiplet contribution belonging to the excited quartet state.

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Acknowledgments

This research was partly supported by the grant of the President of the Russian Federation for Support of Leading Scientific Schools (no. NSh-46267.2010.2). We are grateful to Prof. K. M. Salikhov for useful discussions, to reviewers for helpful comments, and to A. A. Sukhanov and R. B. Zaripov for assistance in conducting the experiment.

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Authors and Affiliations

  1. Zavoisky Physical-Technical Institute, Russian Academy of Sciences, Sibirsky Tract 10/7, Kazan, 420029, Russian Federation

    V. S. Iyudin, Yu. E. Kandrashkin & V. K. Voronkova

  2. A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Leninskiy Prosp. 31, Moscow, 119991, Russian Federation

    V. S. Tyurin & E. N. Kirichenko

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  1. V. S. Iyudin
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  2. Yu. E. Kandrashkin
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  3. V. K. Voronkova
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  4. V. S. Tyurin
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Correspondence to V. K. Voronkova.

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Iyudin, V.S., Kandrashkin, Y.E., Voronkova, V.K. et al. Time-Resolved EPR Spectra of Photoexcited Copper Porphyrin. Appl Magn Reson 40, 75–89 (2011). https://doi.org/10.1007/s00723-010-0184-2

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  • DOI: https://doi.org/10.1007/s00723-010-0184-2

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