Proton-assisted photoinduced electron transfer from porphyrin to quinone: A photo-CIDNP and laser flash photolysis study

John Devens Gust, Thomas A Moore, Ana L Moore, Xiaochun C. Ma, Ronald A. Nieman, Gilbert R. Seely, Robert E. Belford, Jeffery E. Lewis

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Abstract

The mechanism of proton-assisted photoinduced electron transfer from porphyrins to quinones has been investigated by a combination of NMR, photo-CIDNP, laser flash photolysis, and UV-vis absorption techniques. In aromatic solvents containing trifluoroacetic acid, the electron-donor species was found to be the triplet state of the porphyrin dication rather than that of the free-base porphyrin itself. In addition, reaction of the porphyrin dication triplet state with the protonated quinone species QH+, rather than Q, was found to be responsible for the observed electron transfer and the resulting CIDNP signals.

Original languageEnglish
Pages (from-to)4442-4445
Number of pages4
JournalJournal of Physical Chemistry
Volume95
Issue number11
Publication statusPublished - 1991

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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