J. Carbajo, S. Bollo, L. Núñez-Vergara
Dec 1, 2000
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Influential Citations
36
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Journal
Journal of Electroanalytical Chemistry
Abstract
Abstract In this report we have chosen ethyl- m -nitrobenzoate (EMNB) as a prototype of a nitroaromatic compound in order to carry out a detailed cyclic voltammetric study focused on the coupled chemical reaction of the generated nitro radical anion. The study was carried out in mixed media (water+DMF) at different DMF contents and several pH values on both mercury and carbon electrodes. In order to study the coupled chemical reaction it was necessary to choose a narrow pH range between 8 and 10. The coupled chemical reaction follows second order kinetics and we have used Olmstead's procedure to calculate the second order rate constant k 2 . The k 2 values are strongly pH dependent. Typical values of k 2 =are 1.68×10 4 l mol −1 s −1 and 1.15×10 4 l mol −1 s −1 for 60% DMF, pH 9.5 on mercury and GCE, respectively. Considering an EMNB concentration of 0.1 mM the corresponding half life time values were 0.59 s and 0.86 s.