The role of electronic coupling in linear porphyrin arrays probed by single-molecule fluorescence spectroscopy

Jaesung Yang, Ji Eun Lee, Chang Yeon Lee, Naoki Aratani, Atsuhiro Osuka*, Joseph T. Hupp, Dongho Kim

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Single-molecule photophysical properties of two families of linear porphyrin arrays have been investigated by single-molecule fluorescence detection techniques. Butadiyne-linked arrays (ZNB) with extensive φ-conjugation perform as photostable one-quantum systems. This demonstration has been suggested by the long-lasting initial emissive state and subsequent discrete one-step photobleaching in the fluorescence intensity trajectories (FITs). As in the behavior of a one-quantum system, ZNB shows anti-bunching data in the coincidence measurements. On the other hand, in directly-linked arrays (ZN) with strong dipole coupling, each porphyrin moiety keeps individual character in photobleaching dynamics. The stepwise photobleachings in the FITs account for this explanation. Most of the FITs of ZN do not carry momentary cessation of fluorescence emission, which has been explained by the strongly bound electron-hole pair of Frenkel exciton that suppresses charge transfer between the molecule and surrounding polymers. These results give insight into the influences of interchromophorinc interactions between porphyrin moieties in the multiporphyrin arrays on their fluorescence dynamics at the single-molecule level.

Original languageEnglish (US)
Pages (from-to)9219-9225
Number of pages7
JournalChemistry - A European Journal
Volume17
Issue number33
DOIs
StatePublished - Aug 8 2011

Keywords

  • conjugation
  • dipole coupling
  • fluorescence spectroscopy
  • porphyrinoids
  • single-molecule studies

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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