Photoinduced Electron Transfer in a Ferrocene–Distyryl BODIPY Dyad and a Ferrocene–Distyryl BODIPY–C60 Triad

Authors

  • Dr. Jian-Yong Liu,

    1. Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong (China), Fax: (+852) 2603-5057
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    • These two authors contributed equally to this work.

  • Dr. Mohamed E. El-Khouly,

    1. Department of Materials and Life Sciences, Graduate School of Engineering, Osaka University, ALCA (JST), Suita, Osaka 565-0871 (Japan)
    2. Department of Chemistry, Faculty of Science, Kafr El-Sheikh University, Kafr El-Sheikh 33516 (Egypt)
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    • These two authors contributed equally to this work.

  • Prof. Shunichi Fukuzumi,

    Corresponding author
    1. Department of Materials and Life Sciences, Graduate School of Engineering, Osaka University, ALCA (JST), Suita, Osaka 565-0871 (Japan)
    2. Department of Bioinspired Science, Ewha Womans University, Seoul 120-750 (Korea)
    • Department of Materials and Life Sciences, Graduate School of Engineering, Osaka University, ALCA (JST), Suita, Osaka 565-0871 (Japan)
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  • Prof. Dennis K. P. Ng

    Corresponding author
    1. Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong (China), Fax: (+852) 2603-5057
    • Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong (China), Fax: (+852) 2603-5057
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  • BODIPY: Boron Dipyrromethene

Abstract

A ferrocene–distyryl BODIPY dyad and a ferrocene–distyryl BODIPY–C60 triad are synthesized and characterized. Upon photoexcitation at the distyryl BODIPY unit, these arrays undergo photoinduced electron transfer to form the corresponding charge-separated species. Based on their redox potentials, determined by cyclic voltammetry, the direction of the charge separation and the energies of these states are revealed. Femtosecond transient spectroscopic studies reveal that a fast charge separation (kCS=1.0×1010 s−1) occurs for both the ferrocene–distyryl BODIPY dyad and the ferrocene–distyryl BODIPY–C60 triad, but that a relatively slow charge recombination is observed only for the triad. The lifetime of the charge-separated state is 500 ps. Charge recombination of the dyad and triad leads to population of the triplet excited sate of ferrocene and the ground state, respectively.

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