Nagatani, HSuzuki, SFermin, DJGirault, HHNakatani, K2007-01-042007-01-042007-01-04200610.1007/s00216-006-0497-zhttps://infoscience.epfl.ch/handle/20.500.14299/238660WOS:000240713500026The 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.Sulforhodamine 101AdsorptionLiquid/liquid interfacePotential modulated fluorescencetext::journal::journal article::research article