Photochemistry of doubly N-confused porphyrin bonded to non-conventional high oxidation state Ag(III) and Cu(III) ions

Fábio M. Engelmann, Ildemar Mayer, Koiti Araki, Henrique E. Toma, Maurício S. Baptista, Hiromitsu Maeda, Atsuhiro Osuka, Hiroyuki Furuta

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27 Citations (Scopus)

Abstract

The photophysical properties of the free base, silver(III) and copper(III) doubly N-confused porphyrin complexes were examined. The free base species exhibits a low fluorescence quantum yield of 9.1×10-3, which is completely suppressed in the M(III) complexes. However, high singlet oxygen quantum yields were found for the Ag(III) (φΔ=0.92) and Cu(III) (φΔ=0.66) complexes. These results were ascribed to the enhanced intersystem crossing rates, induced by heavy atom effect, rather than to a redox quenching involving the metal ions in unusually high oxidation state. The confused porphyrins are photochemically stable in oxygen-free solution but are bleached more or less rapidly by the photogenerated singlet oxygen, in the absence of other quenchers.

Original languageEnglish
Pages (from-to)403-411
Number of pages9
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume163
Issue number3
DOIs
Publication statusPublished - May 21 2004

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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