Energy Transfer, Excited-State Deactivation, and Exciplex Formation in Artificial Caroteno-Phthalocyanine Light-Harvesting Antennas
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DOI:
10.1021/jp071010q
Publication Date:
2007-05-16T11:01:18Z
AUTHORS (13)
ABSTRACT
We present results from transient absorption spectroscopy on a series of artificial light-harvesting dyads made up zinc phthalocyanine (Pc) covalently linked to carotenoids with 9, 10, or 11 conjugated carbon−carbon double bonds, referred as 1, 2, and 3, respectively. assessed the energy transfer excited-state deactivation pathways following excitation strongly allowed carotenoid S2 state function conjugation length. The rapidly relaxes S* S1 states. In all systems we detected new pathway within manifold in which acts an intermediate → internal conversion sub-picosecond time scale. dyad novel type collective carotenoid−Pc electronic is observed that may correspond excited state(s)−Pc Q exciplex. exciplex only upon direct nonfluorescent. two singlet states, S1, contribute singlet−singlet Pc, making process very efficient (>90%) while for 2 3 channel precluded capable transferring Pc. latter systems, lifetime first Pc dramatically shortened compared 9 double-bond model indicating strong quencher energy.
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