Al-Omari S, Ermilov E, Helmreich M, Jux N, Hirsch A, Röder B (2004)
Publication Type: Journal article, Original article
Publication year: 2004
Original Authors: Omari S.A.L., Ermilov E.A., Helmreich M., Jux N., Hirsch A., Röder B.
Publisher: Springer Verlag (Germany)
Book Volume: 79
Pages Range: 617-622
Journal Issue: 5
DOI: 10.1007/s00340-004-1570-y
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 C 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.
APA:
Al-Omari, S., Ermilov, E., Helmreich, M., Jux, N., Hirsch, A., & Röder, B. (2004). Transient absorption spectroscopy of a monofullerene C60-bis- (pyropheophorbide a) molecular system in polar and nonpolar environments. Applied Physics B-Lasers and Optics, 79(5), 617-622. https://dx.doi.org/10.1007/s00340-004-1570-y
MLA:
Al-Omari, S., et al. "Transient absorption spectroscopy of a monofullerene C60-bis- (pyropheophorbide a) molecular system in polar and nonpolar environments." Applied Physics B-Lasers and Optics 79.5 (2004): 617-622.
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