Excess-Electron Injection and Transfer in Terthiophene-Modified DNA: Terthiophene as a Photosensitizing Electron Donor for Thymine, Cytosine, and Adenine

Authors

  • Man Jae Park,

    1. The Institute of Scientific and Industrial, Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
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  • Prof. Dr. Mamoru Fujitsuka,

    Corresponding author
    1. The Institute of Scientific and Industrial, Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
    • The Institute of Scientific and Industrial, Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
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  • Prof. Dr. Kiyohiko Kawai,

    1. The Institute of Scientific and Industrial, Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
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  • Prof. Dr. Tetsuro Majima

    Corresponding author
    1. The Institute of Scientific and Industrial, Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
    • The Institute of Scientific and Industrial, Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
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Errata

This article is corrected by:

  1. Errata: Corrigendum: Excess-Electron Injection and Transfer in Terthiophene-Modified DNA: Terthiophene as a Photosensitizing Electron Donor for Thymine, Cytosine, and Adenine Volume 18, Issue 24, 7326, Article first published online: 4 June 2012

Abstract

Excess-electron transfer (EET) in DNA has attracted wide attention owing to its close relation to DNA repair and nanowires. To clarify the dynamics of EET in DNA, a photosensitizing electron donor that can donate an excess electron to a variety of DNA sequences has to be developed. Herein, a terthiophene (3T) derivative was used as the photosensitizing electron donor. From the dyad systems in which 3T was connected to a single nucleobase, it was revealed that 13T* donates an excess electron efficiently to thymine, cytosine, and adenine, despite adenine being a well-known hole conductor. The free-energy dependence of the electron-transfer rate was explained on the basis of the Marcus theory. From the DNA hairpins, it became clear that 13T* can donate an excess electron not only to the adjacent nucleobase but also to the neighbor one nucleobase further along and so on. From the charge-injection rate, the possibilities of smaller β value and/or charge delocalization were discussed. In addition, EET through consecutive cytosine nucleobases was suggested.

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