Single-molecule fluorescence dynamics of a butadiyne-linked porphyrin dimer

The effect of conformational flexibility in host polymers

Ji Eun Lee, Jaesung Yang, Dongho Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We have investigated the single-molecule fluorescence dynamics of a butadiyne-linked porphyrin dimer (Z2B) depending on the density of the poly(methyl methacrylate) (PMMA) matrix (5, 10, 25, and 50 mg ml -1). By recording single-molecule fluorescence intensity trajectories and fluorescence lifetimes, we observed more frequent one-step photobleaching behavior, less frequent on-off behavior, and narrower fluorescence lifetime distributions in lower densities of PMMA polymer. In contrast, more enhanced photostability was observed in higher densities of PMMA polymer. These results are explained by a difference in the molecular surroundings depending on the change in PMMA polymer density, suggesting that the individual photophysical properties of Z2B are strongly associated with their conformations and molecular surroundings in the solid state. Our studies will provide further information on the structure/surroundings relationship of single molecules in the solid state.

Original languageEnglish
Pages (from-to)277-288
Number of pages12
JournalFaraday Discussions
Volume155
DOIs
Publication statusPublished - 2012 Feb 21

Fingerprint

Porphyrins
Polymethyl Methacrylate
polymethyl methacrylate
porphyrins
Dimers
flexibility
Polymers
Fluorescence
dimers
fluorescence
Molecules
polymers
molecules
solid state
Photobleaching
life (durability)
Conformations
recording
Trajectories
trajectories

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

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Single-molecule fluorescence dynamics of a butadiyne-linked porphyrin dimer : The effect of conformational flexibility in host polymers. / Lee, Ji Eun; Yang, Jaesung; Kim, Dongho.

In: Faraday Discussions, Vol. 155, 21.02.2012, p. 277-288.

Research output: Contribution to journalArticle

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