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dcterms:title
Single-Molecule Spectroscopic Investigation of EnergyMigration Processes in Cyclic Porphyrin Arrays
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dcterms:abstract
Covalently linked cyclic porphyrin arrays have been synthesized to mimic natural light-harvestingapparatuses and to investigate the highly efficient energy migration processes occurring in these systemsfor future applications in molecular photonics. To avoid an ensemble-averaged picture, we performed asingle-molecule spectroscopic study on the energy migration processes of cyclic porphyrin arrays and alinear model compound embedded in a rigid polymer matrix by recording fluorescence intensity trajectories,by performing coincidence measurements, and by doing wide-field defocused imaging. Our studydemonstrates efficient energy migration within the cyclic porphyrin arrays at the single-molecule level. Bycomparison with the data of the linear model compound, we could pinpoint the role of the dipole−dipolecoupling between diporphyrin subunits and the rigidity of the cyclic structures on the energy transferprocesses.
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