Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 11, Issue 12, Pages 3753-3761Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200500069
Keywords
energy transfer; femtosecond transient absorption; fluorescence spectroscopy; polarization anisotropy; porphyrinoids
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The excitation-energy-hopping (EEH) times within two-dimensional cyclic zinc(ii)-porphyrin arrays 5 and 6, which were prepared by intermolecular coordination and ring-closing metathesis reaction of olefins, were deduced by modeling the EEH process based on the anisotropy depolarization a,, well as the exciton-exciton annihilation dynamics. Assuming the number of energy-hopping sites N=5 and 6, the two different experimental observables, that is, anisotropy depolarization and exciton-excition annihilation times, consistently give the EEH times of 8.0 +/- 0.5 and 5.3 +/- 0.6 ps through the 1,3-phenylene linkages of 5 and 6, respectively. Accordingly, the self-assembled cyclic porphyrin arrays have proven to be well-defined two-dimensional models for natural light-harvesting complexes.
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