Intramolecular and intermolecular energy transfers in donor-acceptor linear porphyrin arrays
Abstract
We present highly time-resolved spontaneous fluorescence spectra of a porphyrin array system that consists of an energy donor and an acceptor linked by a phenyl group. The donors are meso-meso directly linked zinc(II) porphyrin arrays and the acceptor is a zinc(II) 5,15-di(phenylethynyl)porphyrin. The spectra over the entire Q (S1) emission band following the excitation of the donor B (S2) state have been measured directly without the conventional spectral reconstruction method. The time-resolved fluorescence spectra revealed detailed energy relaxation processes within the donor and subsequent energy transfer to the acceptor. The observed energy transfer rates to the acceptor are consistent with the Förster energy transfer rates calculated on the assumption that the energy is localized in the Q state of each porphyrin unit of the donor prior to the energy transfer. The passage of the energy deposited initially on one porphyrin unit of the donor to the acceptor illustrates a sequence of energy delocalization and localization processes before it finally reaches the acceptor.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- August 2006
- DOI:
- 10.1063/1.2333509
- Bibcode:
- 2006JChPh.125g4902R
- Keywords:
-
- 87.15.Kg;
- 87.15.Mi;
- 87.15.He;
- 33.50.Dq;
- Molecular interactions;
- membrane-protein interactions;
- Spectra photodissociation and photoionization;
- luminescence;
- Dynamics and conformational changes;
- Fluorescence and phosphorescence spectra