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.
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1 July 2002
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 A. Moore,
Ana L. Moore
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Photochemistry and Photobiology
Vol. 76 • No. 1
July 2002
Vol. 76 • No. 1
July 2002