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.
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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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Nagatani, H., Suzuki, S., Fermín, D.J. et al. Interfacial behavior of sulforhodamine 101 at the polarized water/1,2-dichloroethane interface studied by spectroelectrochemical techniques. Anal Bioanal Chem 386, 633–638 (2006). https://doi.org/10.1007/s00216-006-0497-z
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DOI: https://doi.org/10.1007/s00216-006-0497-z