Synthesis and photochemistry of a carotene-porphyrin-fullerene model photosynthetic reaction center

Gerdenis Kodis, Paul A. Liddell, Ana Moore, Thomas Moore, Devens Gust

Research output: Contribution to journalArticle

78 Scopus citations

Abstract

A new photosynthetic reaction center mimic consisting of a porphyrin (P) linked to both a fullerene electron acceptor (C60) and a carotenoid secondary electron donor (C) was synthesized and studied in 2-methyltetrahydrofuran using transient spectroscopic methods. Excitation of the porphyrin is followed by photoinduced electron transfer to the fullerene (τ = 32 ps) to yield C-P+-C60-. Electron transfer from the carotene to the porphyrin radical cation (τ = 125 ps) gives a final C+-P-C60- state with an overall yield of 0.95. This state decays to give the carotenoid triplet state with a time constant of 57 ns. The molecular triad is highly soluble in organic solvents and readily synthesized. These qualities make the molecule a useful artificial photosynthetic reaction center for a variety of spectroscopic and photochemical investigations.

Original languageEnglish (US)
Pages (from-to)724-734
Number of pages11
JournalJournal of Physical Organic Chemistry
Volume17
Issue number9
DOIs
StatePublished - Sep 2004

Keywords

  • Carotene
  • Fullerene
  • Photoinduced electron transfer
  • Porphyrin
  • Spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry

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