High-efficiency energy transfer from carotenoids to a phthalocyanine in an artificial photosynthetic antenna

Ernesto Mariño-Ochoa, Rodrigo Palacios, Gerdenis Kodis, Alisdair N. Macpherson, Tomas Gillbro, Devens Gust, Thomas Moore, Ana Moore

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Abstract

Two carotenoid pigments have been linked as axial ligands to the central silicon atom of a phthalocyanine derivative, forming molecular triad 1. Laser flash studies on the femtosecond and picosecond time scales show that both the carotenoid S1 and S2 excited states act as donor states in 1, resulting in highly efficient singlet energy transfer from the carotenoids to the phthalocyanine. Triplet energy transfer in the opposite direction was also observed. In polar solvents efficient electron transfer from a carotenoid to the phthalocyanine excited singlet state yields a charge-separated state that recombines to the ground state of 1.

Original languageEnglish (US)
Pages (from-to)116-121
Number of pages6
JournalPhotochemistry and photobiology
Volume76
Issue number1
DOIs
StatePublished - Jul 1 2002

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ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry

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