Photoexcitation and Electron Transfer Reactions of Zinc Lipidporphyrins in DMSO

Takeru Ohgushi, Zi Chen Li, Fu Mian Li, Teruyuki Komatsu, Shinji Takeoka, Eishun Tsuchida

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    The photophysical and photochemical properties of 5,10,15,20-tetrakis{α,α,α,α-o-[2′,2′- dimethyl-20′-((2″-(trimethylammonio)ethyl)phosphonatoxy)alkanamido] phenyl}porphinatozinc(II) (zinc lipid-porphyrins, ZnLPs (C10, C18)) have been studied in homogeneous DMSO solution and compared with those of 5,10,15,20-tetrakis{α,α,α,α-o-pivalamidophenyl} porphinatozinc(II) (ZnTpivPP) and tetrakis-phenylporphin-atozinc(II) (ZnTPP). The fluorescence quantum yields of the ZnLPs were lower than that of ZnTPP, but their fluorescence lifetimes were relatively long. The electron transfer reactions from the photoexcited states of these Zn porphyrin complexes to several quinone derivatives were evaluated by fluorescence spectroscopy and laser flash photolysis. The efficiences of oxidative quenching of the excited porphyrins via a dynamic process were significantly decreased by the presence of the bulky substituents on one side of the porphyrin macrocycle. This steric effect of the porphyrin side-chains was quantitatively examined by the Marcus classical treatment.

    Original languageEnglish
    Pages (from-to)53-59
    Number of pages7
    JournalJournal of Porphyrins and Phthalocyanines
    Volume3
    Issue number1
    Publication statusPublished - 1999 Jan

    Fingerprint

    Photoexcitation
    Porphyrins
    Dimethyl Sulfoxide
    Zinc
    Electrons
    Fluorescence
    Photolysis
    Fluorescence spectroscopy
    Quantum yield
    Quenching
    Derivatives
    Lipids
    Lasers

    Keywords

    • Electron transfer reactions
    • Fluorescence spectrum
    • Laser flash photolysis
    • Oxidative quenching
    • Quinone derivatives
    • Zinc lipidporphyrins

    ASJC Scopus subject areas

    • Chemistry(all)

    Cite this

    Photoexcitation and Electron Transfer Reactions of Zinc Lipidporphyrins in DMSO. / Ohgushi, Takeru; Li, Zi Chen; Li, Fu Mian; Komatsu, Teruyuki; Takeoka, Shinji; Tsuchida, Eishun.

    In: Journal of Porphyrins and Phthalocyanines, Vol. 3, No. 1, 01.1999, p. 53-59.

    Research output: Contribution to journalArticle

    Ohgushi, T, Li, ZC, Li, FM, Komatsu, T, Takeoka, S & Tsuchida, E 1999, 'Photoexcitation and Electron Transfer Reactions of Zinc Lipidporphyrins in DMSO', Journal of Porphyrins and Phthalocyanines, vol. 3, no. 1, pp. 53-59.
    Ohgushi, Takeru ; Li, Zi Chen ; Li, Fu Mian ; Komatsu, Teruyuki ; Takeoka, Shinji ; Tsuchida, Eishun. / Photoexcitation and Electron Transfer Reactions of Zinc Lipidporphyrins in DMSO. In: Journal of Porphyrins and Phthalocyanines. 1999 ; Vol. 3, No. 1. pp. 53-59.
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