Photoexcitation and Electron Transfer Reactions of Zinc Lipidporphyrins in DMSO

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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
Issue number1
Publication statusPublished - 1999 Jan


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

ASJC Scopus subject areas

  • General Chemistry


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