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High‐efficiency Energy Transfer from Carotenoids to a Phthalocyanine in an Artificial Photosynthetic Antenna ¶
Author(s) -
MariñoOchoa Ernesto,
Palacios Rodrigo,
Kodis Gerdenis,
Macpherson Alisdair N.,
Gillbro Tomas,
Gust Devens,
Moore Thomas A.,
Moore Ana L.
Publication year - 2002
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/0031-8655(2002)0760116heetfc2.0.co2
Subject(s) - phthalocyanine , photochemistry , excited state , chemistry , picosecond , singlet state , electron transfer , femtosecond , flash photolysis , carotenoid , ground state , materials science , atomic physics , laser , physics , organic chemistry , optics , quantum mechanics , reaction rate constant , food science , kinetics
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 S 1 and S 2 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.