Adsorption of phenosafranin at the water|1,2-DCE interface: a voltammetric approach

R.A. IGLESIAS; S.A. DASSIE; A.M.BARUZZI

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Lugar: Amsterdam; Año: 2000 vol. 483 p. 157 - 157

n the present paper the interfacial behavior of a cationic dye, phenosafranin (PhS), is voltammetrically analyzed. A sharp and narrow peak during the negative sweep was observed. The dependence of this peak on concentration, sweep rate and switch potential was a clear indication of an adsorption?desorption process similar to those observed on solid electrodes. It was determined that the adsorbed species results from the ion pairing between dicarbollylcobaltate (DCC) and PhS at the interface as the process is observed only when the interface is polarized at the potential transfer of DCC. The process fitted with a Frumkin isotherm and indicated a strong attractive interaction (g2.3) between the adsorbed species. This interaction was also analyzed spectrophotometrically.