Interfacial Behavior of Sulforhodamine 101 at the Polarized Water|1,2-Dichloroethane Interface Studied by Spectroelectrochemical Techniques

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− ΔWO φ 0 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 ΔWO φ 0: The interfacial mechanism of SR101 is discussed by comparing the results obtained from each technique.


Published in:
Analytical and Bioanalytical Chemistry, 386, 3, 633-638
Year:
2006
Publisher:
Springer Verlag
ISSN:
1618-2642
Keywords:
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 Record created 2007-01-04, last modified 2018-03-17

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