Intramolecular and intermolecular energy transfers in donor-acceptor linear porphyrin arrays

Hanju Rhee, Taiha Joo, Naoki Aratani, Atsuhiro Osuka, Sung Cho, Dongho Kim

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15 Citations (Scopus)

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.

Original languageEnglish
Article number074902
JournalJournal of Chemical Physics
Volume125
Issue number7
DOIs
Publication statusPublished - 2006

Bibliographical note

Funding Information:
This work was supported by the Korea Research Foundation Grant (KRF-2002-005-C00010).

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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