Electrochemical behaviour of 3,5,6-trichloro-4-methyl-pyridine-2-carboxylic acid on mercury and carbon electrodes

This paper presents voltammetric (linear-sweep cyclic voltammetry) and chronoamperometric studies on the electroreduction of 3,5,6-trichloro-4-methylpyridine-2-carboxylic acid (3CMPA) on mercury and carbon electrodes. The dissociation constants of 3CMPA were obtained from UV–vis spectra. The pK valu...

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Bibliographic Details
Published in:Electrochimica acta 2013-07, Vol.102, p.72-78
Main Authors: Ruiz Montoya, M., Mayén, M., Rodríguez-Amaro, R., Rodríguez Mellado, J.M.
Format: Article
Language:English
Subjects:
Accessibility
Carbon
Chloropyridine derivatives
Constants
Electrode kinetics
Electrodes
Mercury
Nucleation
Pyridine herbicides
Reduction mechanisms
Spectra
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Summary:This paper presents voltammetric (linear-sweep cyclic voltammetry) and chronoamperometric studies on the electroreduction of 3,5,6-trichloro-4-methylpyridine-2-carboxylic acid (3CMPA) on mercury and carbon electrodes. The dissociation constants of 3CMPA were obtained from UV–vis spectra. The pK values were 1.7±0.1 (COOH group) and 4.1±0.1 (pyridinic nitrogen). The electrochemical studies were performed in the acidity range 6M H2SO4 to pH 7. Above the last pH value no signals were obtained. 3CMPA is adsorbed on the mercury electrode via a nucleation and growth process but no monolayer is formed in the accessible experimental conditions. From the voltammetric results in the carbon electrode, reaction pathways are proposed.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2013.03.136