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

6 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
DOIs
Publication statusPublished - 1999 Jan

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)

Fingerprint Dive into the research topics of 'Photoexcitation and Electron Transfer Reactions of Zinc Lipidporphyrins in DMSO'. Together they form a unique fingerprint.

  • Cite this