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Analytical and Bioanalytical Chemistry

, Volume 386, Issue 3, pp 633–638 | Cite as

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

  • Hirohisa Nagatani
  • Shingo Suzuki
  • David J. Fermín
  • Hubert H. Girault
  • Kiyoharu Nakatani
Original Paper

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 \({\left( {\Delta ^{{\text{W}}}_{{\text{O}}} \phi ^\circ \prime } \right)}\) 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 \(\Delta ^{{\text{W}}}_{{\text{O}}} \phi ^\circ \prime .\)The interfacial mechanism of SR101 is discussed by comparing the results obtained from each technique.

Keywords

Sulforhodamine 101 Adsorption Liquid/liquid interface Potential modulated fluorescence 

Notes

Acknowledgements

This work was partly supported by a Grant-in-Aid for Scientific Research of Priority Areas (No. 13129202) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT). H.N. gratefully acknowledges a Grant-in-Aid for Young Scientists (B) (No. 17750070) from MEXT. The authors are also indebted to Dr. Toshiyuki Osakai of Kobe University for valuable discussions.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Department of Applied Chemistry, Faculty of EngineeringNagasaki UniversityBunkyoJapan
  2. 2.Department of Chemistry, Graduate School of Pure and Applied SciencesUniversity of TsukubaTsukubaJapan
  3. 3.Departement für Chemie und BiochemieUniversität BernBernSwitzerland
  4. 4.Laboratoire d’Electrochimie Physique et Analytique, Institut de Chimie Molécularie et BioligiqueEcole Polytechnique Fédérale de LausanneLausanneSwitzerland

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