Relaxation dynamics and structural characterization of organic nanobelts with aggregation-induced emission

Chih Wei Chang, Chetan Jagdish Bhongale, Chi Shen Lee, Wei Kai Huang, Chain Shu Hsu, Eric Wei Guang Diau

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We prepared the fluorescent nanobelts of cyano-substituted 1,4-distyrylbenzene derivative (CNDSB) with the reprecipitation method. CNDSB is nonemissive in solution but with strong aggregation-induced emission (AIE) in belt-like structure. The molecular structure predicted by quantum chemical calculations indicates a twisted conformation of CNDSB monomer, while the solid-state X-ray structure of the CNDSB crystal features herringbone-type arrangement and three benzene rings arrange in nearly planar conformation. Femto- and picosecond time-resolved fluorescence spectroscopy are implemented to study the photophysics and the origin of the AIE effect in CNDSB nanobelts. The fluorescence quenching of CNDSB in THF solution arises from the efficient nonradiative isomerization channel. In this study, the fluorescence decay of CNDSB embedded in poly(methyl methacrylate) matrix is slowed down due to the restriction of intramolecular motions in the solid matrix. In nanobelt structure, the fluorescence lifetime further increases due to the intermolecular interaction between H-type aggregates. Both the steady-state and time-resolved studies suggests that there are at least two different packing structures might exist in nanobelts, and the relative composition of these two different structures gradually changes in different sizes of nanobelts.

Original languageEnglish
Pages (from-to)15146-15154
Number of pages9
JournalJournal of Physical Chemistry C
Volume116
Issue number28
DOIs
Publication statusPublished - 2012 Jul 19

Fingerprint

Nanobelts
Agglomeration
Derivatives
fluorescence
Fluorescence
matrices
Conformations
polymethyl methacrylate
isomerization
constrictions
molecular structure
monomers
quenching
benzene
Time and motion study
solid state
life (durability)
Fluorescence spectroscopy
Polymethyl Methacrylate
Isomerization

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Chang, Chih Wei ; Bhongale, Chetan Jagdish ; Lee, Chi Shen ; Huang, Wei Kai ; Hsu, Chain Shu ; Diau, Eric Wei Guang. / Relaxation dynamics and structural characterization of organic nanobelts with aggregation-induced emission. In: Journal of Physical Chemistry C. 2012 ; Vol. 116, No. 28. pp. 15146-15154.
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abstract = "We prepared the fluorescent nanobelts of cyano-substituted 1,4-distyrylbenzene derivative (CNDSB) with the reprecipitation method. CNDSB is nonemissive in solution but with strong aggregation-induced emission (AIE) in belt-like structure. The molecular structure predicted by quantum chemical calculations indicates a twisted conformation of CNDSB monomer, while the solid-state X-ray structure of the CNDSB crystal features herringbone-type arrangement and three benzene rings arrange in nearly planar conformation. Femto- and picosecond time-resolved fluorescence spectroscopy are implemented to study the photophysics and the origin of the AIE effect in CNDSB nanobelts. The fluorescence quenching of CNDSB in THF solution arises from the efficient nonradiative isomerization channel. In this study, the fluorescence decay of CNDSB embedded in poly(methyl methacrylate) matrix is slowed down due to the restriction of intramolecular motions in the solid matrix. In nanobelt structure, the fluorescence lifetime further increases due to the intermolecular interaction between H-type aggregates. Both the steady-state and time-resolved studies suggests that there are at least two different packing structures might exist in nanobelts, and the relative composition of these two different structures gradually changes in different sizes of nanobelts.",
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Relaxation dynamics and structural characterization of organic nanobelts with aggregation-induced emission. / Chang, Chih Wei; Bhongale, Chetan Jagdish; Lee, Chi Shen; Huang, Wei Kai; Hsu, Chain Shu; Diau, Eric Wei Guang.

In: Journal of Physical Chemistry C, Vol. 116, No. 28, 19.07.2012, p. 15146-15154.

Research output: Contribution to journalArticle

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