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

• Published in: Electroanalysis (New York, N.Y.) Vol. 23; no. 6; pp. 1401 - 1409
• Main Authors: García, Camilo, Domínguez, Cristian, Aliaga, Alvaro, Matsuhiro, Betty, Mendoza, Leonora, Aguirre, María J., Isaacs, Mauricio
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.06.2011; WILEY‐VCH Verlag
• Subjects: Amperometric sensor; Conducting polymer films; Conduction; Electrical measurements; Electrocatalysis; Electrodes; Ethyl alcohol; Iron polypyridyl complexes; Reduction; Rotating disks; Sulfite; UV-vis spectroelectrochemistry; Voltammetry
• ISSN: 1040-0397; 1521-4109; 1521-4109
• DOI: 10.1002/elan.201000769

A new conducting film derived from the complex [Fe (diaphen)3]2+, (diaphen=5,6‐diamino‐1,10‐phenanthroline) was electropolymerized by cyclic voltammetry onto a glassy carbon electrode. Poly‐[FeII (diaphen)3] was studied by cyclic voltammetry, SEM, UV‐vis and micro‐Raman spectroscopy. Poly‐[FeII (diaphen)3] shows electrocatalytic activity in HSO3− reduction in an ethanol/water solution. Electrocatalysis is centered at the π ring of phenanthroline. Rotating disk electrode studies showed a 0.117 V/dec Tafel slope, suggesting an EC process where the electrochemical process is the determining step. The chemical step was studied by UV‐vis spectroelectrochemistry. Amperometric behavior showed a linear range between 47.5 µM to 417 µM and the LOD was 19.5 µM.