Adsorption of Phenosafranin at the Water-1,2 DCE Interface: A Voltammetric Approach

RODRIGO A IGLESIAS; SERGIO A DASSIE; ANA M BARUZZI

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

Elsevier

Año: 2000 vol. 483 p. 157 - 157

0022-0728

span lang="en" style="FONT-SIZE: 12pt; FONT-FAMILY: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">In 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 (g=-2.3) between the adsorbed species. This