Photoexcitation and Electron Transfer Reactions of Zinc Lipidporphyrins in DMSO

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

研究成果: Article査読

6 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)53-59
ページ数7
ジャーナルJournal of Porphyrins and Phthalocyanines
3
1
DOI
出版ステータスPublished - 1999 1

ASJC Scopus subject areas

  • Chemistry(all)

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