INVESTIGADORES
DASSIE Sergio Alberto
artículos
Título:
Competitive facilitated ion transfer reactions across oil-water interfaces
Autor/es:
R.A. IGLESIAS; S.A. DASSIE
Revista:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Editorial:
ELSEVIER
Referencias:
Lugar: Amsterdam; Año: 2002 vol. 533 p. 1 - 17
ISSN:
0022-0728
Resumen:
In this paper are presented the general equations for a model of competitive facilitated ion transfer reactions across oil j water
interfaces. In other words, the transfer of two cations Mz1
1 (w) and Mz2
2 (w) that, under certain conditions, compete for a neutral
ligand is analyzed. The results obtained agree with those of Matsuda and coworkers (J. Electroanal. Chem. 509 (2001) 128) for the
same system under limiting conditions and also with the general voltammetric criteria reported by Girault et al. (J. Electroanal.
Chem. 449 (1998) 49, J. Electroanal. Chem. 451 (1998) 59) for the facilitated transfer of a single cation assisted by a neutral ligand.
The equations reported in this paper allow the cyclic voltammetric response of the system to be simulated under all the possible
conditions. The results are analyzed for different zones determined by the cation/ligand concentration ratios. The principal
contribution of this work is the complete analysis and characterization of a competitive transfer mechanism of two different cations.
The first cation transfer is followed by an interfacial cation-exchange (TICE) reaction in accord with the following equation:
Mz1
1 (w)M2Lz2(o)?M1Lz1(o)Mz2
2 (w): The experimental conditions where a cation is transferred by two different mechanisms
during the same potential sweep are defined (e.g. aqueous complexation followed by transfer (ACT) and TICE mechanism or
transfer by interfacial complexation (TIC) and TICE mechanism).