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Generation of long-lived radical ions through enhanced photoinduced electron transfer processes between [60]fullerene and phenothiazine derivatives

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Abstract

Photoinduced electron transfer processes between fullerenes (C60) and four phenothiazine derivatives (PTZs) in the absence and presence of hexylviologen dication (HV2+) have been studied by the transient absorption method in the visible and near-IR regions. Electron-transfer takes place from PTZs to the triplet states of fullerenes (3C60*) giving the radical anion of fullerenes (C60·-) and the radical cations of PTZs (PTZ·+). The rate constants and efficiencies of electron transfer are quite high, because of the high electron-donor abilities of PTZs as elucidated by their low oxidation potentials. On addition of HV2+ to the C60 and PTZ systems, the electron-mediating process occurs from C60·- to HV2+, yielding the viologen radical cation (HV·+). In the presence of a sacrificial donor, HV·+ persisted for a long time.

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Authors and Affiliations

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

    Yoshiko Sasaki, Yasuyuki Araki & Osamu Ito

  2. Department of Molecular and Medical Pharmacology, The Crump Institute for Molecular Imaging, University of California, Los Angeles 700 Westwood Plaza, Los Angeles, CA, 90095-1770, USA

    Maksudul M. Alam

Authors
  1. Yoshiko Sasaki
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  2. Yasuyuki Araki
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  3. Osamu Ito
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  4. Maksudul M. Alam
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Correspondence to Osamu Ito.

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Sasaki, Y., Araki, Y., Ito, O. et al. Generation of long-lived radical ions through enhanced photoinduced electron transfer processes between [60]fullerene and phenothiazine derivatives. Photochem Photobiol Sci 6, 560–565 (2007). https://doi.org/10.1039/b617229f

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  • DOI: https://doi.org/10.1039/b617229f

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