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Influence of C60 Aggregation on Pseudorotation in the Excited Triplet State Probed by Multifrequency Time-Resolved EPR

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Abstract

The influence of C60 aggregation on time-resolved (TR) electron paramagnetic resonance (EPR) of C60 in the excited triplet state was investigated by multifrequency EPR techniques. Temperature-independent X-band (9.7 GHz) TR-EPR spectra were observed in a fresh toluene solution, while temperature-dependent ones were reported in literatures. The experimental spectra in this study indicated that the pseudorotation of pristine C60 in frozen toluene solution is not frozen out even at lower temperatures. Careful investigations of TR-EPR and its decay kinetics demonstrated that the pseudorotation can be affected by C60 aggregation. A comparison between X- and W-band (94.9 GHz) results indicated that the aggregation can be accelerated by a capillary effect. Three decay constants were extracted from the analysis of the decay kinetics. The fastest component was ascribed to the pseudorotation, which was independent of temperature in the range of 10–40 K. The temperature dependences of the decay kinetics showed that the pseudorotation is not affected by C60 aggregation at higher temperatures.

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Acknowledgments

We thank Prof. Kou Furukawa and Prof. Toshikazu Nakamura at Institute for Molecular Science for their assistance with obtaining the X-band pulsed EPR. We are also grateful to Prof. Yasunori Ohba at Tohoku University for his invaluable discussion. This work was supported by Grants-in-Aid for Scientific Research (C) and Scientific Research on Innovative Areas, “Quantum Cybernetics”, MEXT, Japan.

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Authors and Affiliations

  1. Institute for Physical and Theoretical Chemistry, University of Bonn, Wegelerstr. 12, 53115, Bonn, Germany

    Hideto Matsuoka

  2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Sendai, 980-8577, Japan

    Hideto Matsuoka, Takuya Kotaki & Seigo Yamauchi

Authors
  1. Hideto Matsuoka
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  2. Takuya Kotaki
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  3. Seigo Yamauchi
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Correspondence to Hideto Matsuoka.

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Matsuoka, H., Kotaki, T. & Yamauchi, S. Influence of C60 Aggregation on Pseudorotation in the Excited Triplet State Probed by Multifrequency Time-Resolved EPR. Appl Magn Reson 45, 901–909 (2014). https://doi.org/10.1007/s00723-014-0569-8

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  • DOI: https://doi.org/10.1007/s00723-014-0569-8

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