The influence of a solid/liquid interface on the fluorescence kinetics of the triphenylmethane dye malachite green

M. A. Bell, B. Crystall, Gary Rumbles, G. Porter, D. R. Klug

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Time-resolved fluorescence measurements are reported of a triphenylmethane dye (malachite green), adsorbed at and aqueous/quartz interface, studied by evanescent wave excitation. The importance of internal conversion as the dominant deactivation pathway from the first excited singlet state of malachite green is observed to be greatly reduced for molecules at a solid/liquid interface compared to those in low viscosity solvents. Surface coverage dependent decay kinetics are observed, and at the lowest surface coverages studied, the excited singlet state lifetime of the dye is more than two orders of magnitude greater than the value observed for the dye in aqueous solution. Fluorescence decay kinetics are found to be non mono-exponential under all conditions, and the limitations of simple sum-of-exponentials fitting are discussed in light of other models currently available. It is possible to distinguish at least two populations of malachite green adsorbed at the surface.

Original languageEnglish
Pages (from-to)15-22
Number of pages8
JournalChemical Physics Letters
Volume221
Issue number1-2
DOIs
Publication statusPublished - Apr 15 1994

Fingerprint

liquid-solid interfaces
Coloring Agents
dyes
Fluorescence
Excited states
fluorescence
Kinetics
kinetics
Liquids
Quartz
evanescent waves
wave excitation
internal conversion
decay
deactivation
excitation
quartz
Viscosity
viscosity
aqueous solutions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

The influence of a solid/liquid interface on the fluorescence kinetics of the triphenylmethane dye malachite green. / Bell, M. A.; Crystall, B.; Rumbles, Gary; Porter, G.; Klug, D. R.

In: Chemical Physics Letters, Vol. 221, No. 1-2, 15.04.1994, p. 15-22.

Research output: Contribution to journalArticle

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