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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 59877.0, MPI für Polymerforschung / MPI Polymerforschung
Revealing competitive Forster-type resonance energy-transfer pathways in single bichromophoric molecules
Authors:Hofkens, J.; Cotlet, M.; Vosch, T.; Tinnefeld, P.; Weston, K. D.; Ego, C.; Grimsdale, Andrew; Müllen, Klaus; Beljonne, D.; Bredas, J. L.; Jordens, S.; Schweitzer, G.; Sauer, M.; De Schryver, F.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Proceedings of the National Academy of Sciences of the United States of America
Journal Abbrev.:P. Natl. Acad. Sci. USA
Issue / Number:23
Start Page:13146
End Page:13151
Review Status:not specified
Audience:Not Specified
Abstract / Description:We demonstrate measurements of the efficiency of competing Forster-type energy-transfer pathways in single bichromophoric systems by monitoring simultaneously the fluorescence intensity, fluorescence lifetime, and the number of independent emitters with time. Peryleneimide end-capped fluorene trimers, hexamers, and polymers with interchromophore distances of 3.4, 5.9, and on average 42 nm, respectively, served as bichromophoric systems. Because of different energy-transfer efficiencies, variations in the interchromophore distance enable the switching between homo-energy transfer (energy hopping), singlet-singlet annihilation, and singlet-triplet annihilation. The data suggest that similar energy-transfer pathways have to be considered in the analysis of single-molecule trajectories of donor/acceptor pairs as well as in natural and synthetic multichromophoric systems such as light-harvesting antennas, oligomeric fluorescent proteins, and dendrimers. Here we report selectively visualization of different energy-transfer pathways taking place between identical fluorophores in individual bichromophoric molecules.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Katholieke Univ Leuven, Dept Chem, Lab Photochem & Spect, Celestijnenlaan 200F, B-3001 Heverlee, Belgium.; Univ Heidelberg, Inst Phys Chem, D-69120 Heidelberg, Germany.; Univ Mons, B-7000 Mons, Belgium.; Univ Arizona, Dept Chem, Tucson, AZ 85721 USA.
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