Temperature dependence of excimer formation and excimer fluorescence polarization in micellar dispersions: Surfactants as intrinsic probes

M. Aoudia, M. A J Rodgers, W. H. Wade

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Experiments have been carried out in which the temperature dependence of the fluorescence spectrum of alkylbenzenesulfonate surfactants has been studied. Excitation of the benzene chromophore above the critical micelle concentration in aqueous dispersions showed the presence of the spectral components due to both monomer and excited dimer species. The ratio of the intensities of the two fluorescent peaks allowed an examination of the monomer-excimer equilibrium in the micellar phase. The activation energy of excimer formation for different isomers was obtained and comparisons drawn with the behavior of sterically hindered benzenes in homogeneous solution. In other studies, pyrene molecules were incorporated in the surfactant micelles as extrinsic probes. Temperature studies of its monomer-excimer behavior enabled both excimer binding energy and activation energy to be evaluated. It was concluded that the pyrene probe and the benzene intrinsic probe occupy the micellar assembly such that their environments exhibit different viscosities.

Original languageEnglish
Pages (from-to)5008-5012
Number of pages5
JournalJournal of Physical Chemistry
Volume88
Issue number21
Publication statusPublished - 1984

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excimers
Benzene
Dispersions
Surface-Active Agents
Surface active agents
Monomers
Fluorescence
surfactants
Pyrene
Polarization
fluorescence
temperature dependence
monomers
probes
benzene
pyrenes
polarization
Activation energy
micelles
Critical micelle concentration

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Temperature dependence of excimer formation and excimer fluorescence polarization in micellar dispersions : Surfactants as intrinsic probes. / Aoudia, M.; Rodgers, M. A J; Wade, W. H.

In: Journal of Physical Chemistry, Vol. 88, No. 21, 1984, p. 5008-5012.

Research output: Contribution to journalArticle

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