Electrochemical Reduction of S(IV) Compounds in Water‐Ethanol Solutions at Nafion/Tetraruthenated Porphyrins Glassy Carbon Modified Electrodes

Abstract

This work describes electrocatalytic detection of S(IV) compounds in water-ethanol solutions under acidic conditions, on a glassy carbon electrode modified with Co(II) tetraruthenated porphyrin electrostatically assembled onto a Nafion film. The Ipc current shows a linear relationship with the concentration of S(IV) oxo-anions. Controlled potential electrolysis shows that thiosulfate was detected as reaction product. Rotating disk electrode and UV-visible spectroelectrochemistry experiments showed a kinetic limitation to the electron transfer controlled by charge propagation in the film and the formation of an intermediary between Co center and S(IV) species. The reproducibility of the modification methodology presents a RSD of 4.1%.This work was supported by the program “Anillo Bicentenario de Ciencia y Tecnolog a CONICYT”ACTN824. K. C. and M. G. are grateful to CONICYT doctoral scholarships

Electrochemical Conversion of Carbon Dioxide into CHO‐Containing Compounds on Multimetallic Porphyrins

“…Previous publications carried out by our research group describe the morphology of both surfaces modified electrode ,,. However, new insights and properties are described below.…”

“…These kind of macrocycles are particularly attractive because they display unusual electrocatalytic and photoelectrochemical properties. In particular, these porphyrins have been used in the electroanalytical detection of S (IV) oxoanions and electrocatalytic reduction processes of O 2 and CO 2 ,. In all cases, a multielectron transfer is essential to enhance the catalytic activity ,,,…”

“…A strategy that may allow one to take full advantage of these is the use of polymers as support. Particularly in this case, the polymer acts as support of metalloporphyrins, substantially increasing reactivity and stability,,, thereby optimizing the cooperative action between the metalloporphyrin molecule and the polymer by generating a 3D architecture ,,,. The synergy between the metalloporphyrin and the polymer could find use in molecular electronics because it allows for both electronic and photonic conduction and also the development of anisotropic functional materials .…”

Electrochemical Properties of a Conducting Film Derived from Iron(II) Tris(diaminopolypyridyl) Complex in the S(IV) Oxoanions Reduction

“…For all the reasons explained here, new systems able to sense the reduction of this sulfur oxoanion, have been sought before any direct analysis in real samples [5,9].…”

Fast Electrochemical Detection of Non-Desirable Aging in Bottled White Wine

“…In this sense different amperometric sensors are developed to measure sulfur dioxide (the most important wine preservative) or different phenols in model wine [1][2][3][4][5][6][7][8][9][10] . However the goal is not achieved due the high complexity of different wines.…”