ENERGY TRANSFER FROM CAROTENOID POLYENES TO PORPHYRINS: A LIGHT-HARVESTING ANTENNA |
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| Authors: | Ana L Moore Gary Dirks Devens Gust Thomas A Moore |
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| Institution: | Department of Chemistry, Arizona State University, Tempe, AZ 85281, USA |
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| Abstract: | Carotenoid to porphyrin singlet-singlet energy transfer has been observed in a new covalently linked carotenoid-porphyrin ester. Nuclear magnetic resonance studies reveal that the relatively high energy transfer efficiency (? 25%) is a result of a stacked conformation in which the 26 π electron carotenoid chromophore resides ?4–5 Å above the mean porphyrin plane. Substantial quenching of porphyrin fluorescence was also observed. Implications for the mechanism of energy transfer and possible applications to synthetic solar energy conversions systems are discussed. |
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