SULFITE OXIDATION MEDIATED BY ORTHO-PHENYLENEDIAMINE / CO(II)-TETRAKIS(PARA-AMINOPHENYL)PORPHYRIN COPOLYMERS IN ACID MEDIUM

Arce, Roxana; MÁRQUEZ, PAULINA; Herrera, Francisco; Aguirre, María J.; Romero, Julio

Abstract

The aim of this work is to study the sulfite oxidation mediated by glassy carbon electrodes modified with copolymers formed by ortho-phenylenediamine (OPD) and Co(II)-tetrakis(para-aminophenyl) porphyrin (CoTAPP). The copolymer was obtained through continuous cycling of potential of a glassy carbon electrode in acid medium containing each respective homopolymer in 1: 1 feeding volume, in which the ortho-phenylenediamine concentration was 1 center dot 10(-1) M and the CoTAPP concentration was 1 center dot 10-4 M. The film obtained is thin, stable and contains a low amount of porphyrin in comparison to the amount in ortho-phenylenediamine. Its electrocatalytic activity was tested toward the sulfite oxidation. In this case, this film is more electrocatalytic than the modified electrode modified with the CoTAPP electropolymer, even though ortho-phenylenediamine is inactive in this reaction. In this work the electrocatalysis process, the morphology of the film, and the difference of electrocatalytic behavior between the ortho-phenylenediamine and cobalt porphyrin homopolymers and the ortho-phenylenediamine-porphyrin copolymer were studied. The morphologic studies were done using Au electrodes since the electrocatalytic activity on Au and on glassy carbon are quite similar.

Más información

Título según WOS: SULFITE OXIDATION MEDIATED BY ORTHO-PHENYLENEDIAMINE/CO(II)-TETRAKIS(PARA-AMINOPHENYL)PORPHYRIN COPOLYMERS IN ACID MEDIUM
Título según SCIELO: SULFITE OXIDATION MEDIATED BY ORTHO-PHENYLENEDIAMINE / CO(II)-TETRAKIS(PARA-AMINOPHENYL)PORPHYRIN COPOLYMERS IN ACID MEDIUM
Título de la Revista: Journal of the Chilean Chemical Society
Volumen: 58
Número: 4
Editorial: 2013
Fecha de publicación: 2013
Página de inicio: 1982
Página final: 1985
Idioma: English
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072013000400016&lng=en&nrm=iso&tlng=en
DOI:

10.4067/S0717-97072013000400016

Notas: ISI, SCIELO