Interfacial behavior of sulforhodamine 101 at the polarized water/1,2-dichloroethane interface studied by spectroelectrochemical techniques

Hirohisa Nagatani*, Shingo Suzuki, David J. Fermin, Hubert H. Girault, Kiyoharu Nakatani

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

17 Citations (Scopus)

Abstract

The transfer mechanism of an amphoteric rhodamine, sulforhodamine 101 (SR101), across the polarized water/1,2-dichloroethane (DCE) interface was investigated using cyclic voltammetry, differential voltfluorometry and potential-modulated fluorescence (PMF) spectroscopy. The voltammetric response for the ion transfer of SR101 monoanion from water to DCE was observed as the diffusion-controlled transfer process. An unusual voltammetric response was found at 0.15 V more negative than the formal transfer potential of SR101(-)(Delta(W)(O)phi degrees') in the cyclic voltammogram and voltfluorogram. The frequency dependence of the PMF responses confirmed the presence of the adsorption processes at negative potentials. In addition, a further transient adsorption step was uncovered at Delta(W)(O)phi degrees'. The interfacial mechanism of SR101 is discussed by comparing the results obtained from each technique.

Original languageEnglish
Pages (from-to)633-638
Number of pages6
JournalAnalytical and Bioanalytical Chemistry
Volume386
Issue number3
DOIs
Publication statusPublished - Oct 2006

Keywords

  • sulforhodamine 101
  • adsorption
  • liquid/liquid interface
  • potential modulated fluorescence
  • BAR 1,2-DICHLOROETHANE INTERFACE
  • MODULATED FLUORESCENCE SPECTROSCOPY
  • INTERNAL-REFLECTION FLUOROMETRY
  • SURFACE 2ND-HARMONIC GENERATION
  • LIQUID-LIQUID INTERFACE
  • ION TRANSFER-REACTIONS
  • LIQUID/LIQUID INTERFACE
  • RHODAMINE-B
  • OCTADECYLRHODAMINE B
  • TRANSIENT ADSORPTION

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