Prussian Blue Films Produced by Pentacyanidoferrate(II) and Their Application as Active Electrochemical Layers. Issue 34 (24th September 2014)

• Record Type: Journal Article
• Authors: Morandi Pires, Bruno; Venturinelli Jannuzzi, Sergio Augusto; Barboza Formiga, André Luiz; Alves Bonacin, Juliano
• Is Part Of: European journal of organic chemistry. Issue 34(2014)
• Page Start: 5812
• Page End: N5819
• Publication Date: 2014-09-24
• Subjects: Electrochemistry -- Redox chemistry -- Sensors -- UV/Vis spectroscopy -- Iron; Chemistry, Organic -- Periodicals; Organic compounds -- Synthesis -- Periodicals; Bioorganic chemistry -- Periodicals; Chemistry, Physical organic -- Periodicals; 547
• DOI: 10.1002/ejic.201402760
• Languages: English
• ISSNs: 1434-193X

Abstract

Abstract: Iron complexes such as ferri/ferrocyanides are usually employed as electrochemical mediators in portable devices for the quick diagnosis of diseases. Stable complexes designed for the electrochemical active layer may render devices with better performance and lifetimes than conventional devices. In this work we have synthesized and characterized spectroscopically, electrochemically, and by DFT the complex Na4 [Fe(CN)5 (isn)] (isn = isonicotinate). This complex was used as a single‐source precursor of Prussian Blue (PB) in solution at pH 2.0 and 3.0, as confirmed by UV/Vis spectroscopy. Potentiostatic deposition of PB onto glassy carbon electrodes provided stable films at pH 3.0 and 5.0, with electrocatalytic activity for ascorbic acid oxidation with a linear response in the range 20–200 μM and an limit of detection of 12 μM . The anodic peak potential of the modified electrodes varied with solution pH with a minimum value of 0.350 V versus NHE at pH 5.0. Abstract : Prussian Blue is widely used in electrochemical sensors due to its ability to catalyze H2 O2 reduction. Glucose meters are common point‐of‐care devices that employ ferricyanide as a redox mediator. The sensitivity, selectivity, and specificity of these devices can be improved by using Prussian Blue produced by pentacyanidoferrate(II) as an electroactive species rather than a redox mediator.