Pulse radiolytic and electrochemical investigations of intramolecular electron transfer in carotenoporphyrins and carotenoporphyrin-quinone triads

Edward J. Land, Doris Lexa, René V. Bensasson, Devens Gust, Thomas Moore, Ana Moore, Paul A. Liddell, Gregory A. Nemeth

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Thermodynamic and kinetic aspects of intramolecular electron-transfer reactions in carotenoporphyrin dyads and carotenoid-porphyrin-quinone triads have been studied by using pulse radiolysis and cyclic voltammetry. Rapid (<1 μs) electron transfer from carotenoid radical anions to attached porphyrins has been inferred. Carotenoid cations, on the other hand, do not readily accept electrons from attached porphyrins or pyropheophorbides. Electrochemical studies provide the thermodynamic basis for these observations and also allow estimation of the energetics of photoinitiated two-step electron transfer and two-step charge recombination in triad models for photosynthetic charge separation.

Original languageEnglish (US)
Pages (from-to)4831-4835
Number of pages5
JournalJournal of physical chemistry
Volume91
Issue number18
DOIs
StatePublished - 1987

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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