Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 163, Issue 3, Pages 403-411Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2004.01.010
Keywords
doubly N-confused porphyrin; singlet oxygen; energy transfer
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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 x 10(-3), which is completely suppressed in the M(III) complexes. However, high singlet oxygen quantum yields were found for the Ag(III) (phi(Delta) = 0.92) and Cu(III) (phi(Delta) = 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. (C) 2004 Elsevier B.V. All rights reserved.
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