Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 34, Pages 5812-5819Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201402760
Keywords
Electrochemistry; Redox chemistry; Sensors; UV/Vis spectroscopy; Iron
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Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Fundo de Apoio ao Ensino, a Pesquisa e a Extensao - Universidade Estadual de Campinas (FAEPEX-UNICAMP) [1321/12]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- National Center for High Performance Computing in Sao Paulo (CENAPAD) [557/2013]
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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 Na-4[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 mu M and an limit of detection of 12 mu M. 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.
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