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Transient absorption spectroscopy of a monofullerene C60-bis-(pyropheophorbide a) molecular system in polar and nonpolar environments

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Abstract

The population dynamics of the excited and ground states of the monofullerene-bis (pyropheophorbide a) complex (FP1) were studied in polar (DMF) and nonpolar (toluene) solvents using picosecond transient absorption techniques. A strong quenching of the fluorescence signal of FP1 was observed in both solvents, in comparison to the fluorescence of bis (pyropheophorbide a) (P2). This quenching is due to an intramolecular photoinduced electron transfer from the pyropheophorbide a (pyroPheo) moiety to the fullerene C60 monoadduct. In DMF the charge-separated (CS) state of FP1 has a lifetime of 0.32 ns and undergoes a direct transition to the ground state, resulting in a very low value of photosensitised singlet oxygen generation. In toluene, energy transfer from the first excited triplet state of pyroPheo, which has been populated via relaxation of the CS state, generates a considerable amount of singlet oxygen. The lifetime of the CS state in the nonpolar solvent was estimated to be 0.29 ns. It was also shown that in both DMF and toluene the first excited singlet state as well as the triplet state of the fullerene moiety in FP1 are not occupied.

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Authors and Affiliations

  1. Institut für Physik, Photobiophysik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489, Berlin, Germany

    S. Al Omari, E.A. Ermilov & B. Röder

  2. Institut für Organische Chemie, Universität Erlangen-Nürnberg, Henkestr. 42, 91054, Erlangen, Germany

    M. Helmreich, N. Jux & A. Hirsch

Authors
  1. S. Al Omari
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  2. E.A. Ermilov
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  3. M. Helmreich
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  4. N. Jux
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  5. A. Hirsch
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  6. B. Röder
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Corresponding author

Correspondence to B. Röder.

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PACS

31.70.Dk; 31.70.Hq; 33.50.-j; 34.70.+e

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Al Omari, S., Ermilov, E., Helmreich, M. et al. Transient absorption spectroscopy of a monofullerene C60-bis-(pyropheophorbide a) molecular system in polar and nonpolar environments. Appl Phys B 79, 617–622 (2004). https://doi.org/10.1007/s00340-004-1570-y

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  • DOI: https://doi.org/10.1007/s00340-004-1570-y

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