Experimental and theoretical studies of electrochemical characteristics of 3,4-dihydroxyphenylacetic acid (DOPAC)

Hamid R. Zare; Mansoor Namazian; Michelle L. Coote

doi:10.1016/j.electacta.2009.04.012

Experimental and theoretical studies of electrochemical characteristics of 3,4-dihydroxyphenylacetic acid (DOPAC)

Hamid R. Zare^*, Mansoor Namazian, Michelle L. Coote

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

The electrochemical behavior of 3,4-dihydroxyphenylacetic acid (DOPAC) in aqueous solutions with different pHs and DOPAC concentrations was studied by cyclic voltammetry at various potential scan rates. The electro-oxidation of DOPAC involves a transfer of two electrons and two protons in solutions of pH < 8.0 and a transfer of two electrons and one proton in solutions of pH > 8.0, in agreement with the one-step two-electron mechanism. The cyclic voltammetry indicated that the process of electro-oxidation of DOPAC follows an E_rC_i mechanism. The standard redox potential, E⁰′, two-proton-two-electron and one-proton-two-electron processes of DOPAC were determined as 0.585 and 0.357 V versus saturated calomel electrode (SCE), respectively. The acidic dissociation constant of DOPAC was also obtained. Also, the diffusion coefficient of DOPAC was calculated as 9.2 × 10^-6 cm² s^-1 for the experimental conditions, using chronoamperometric results. The standard reduction potentials and the second acidic constant of DOPAC have been also calculated using standard ab initio calculations at the G3 level of theory in conjunction with a continuum solvation model. The theoretical values are in good agreement with experiment.

Original language	English
Pages (from-to)	5353-5357
Number of pages	5
Journal	Electrochimica Acta
Volume	54
Issue number	23
DOIs	https://doi.org/10.1016/j.electacta.2009.04.012
Publication status	Published - 30 Sept 2009

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10.1016/j.electacta.2009.04.012

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title = "Experimental and theoretical studies of electrochemical characteristics of 3,4-dihydroxyphenylacetic acid (DOPAC)",

abstract = "The electrochemical behavior of 3,4-dihydroxyphenylacetic acid (DOPAC) in aqueous solutions with different pHs and DOPAC concentrations was studied by cyclic voltammetry at various potential scan rates. The electro-oxidation of DOPAC involves a transfer of two electrons and two protons in solutions of pH < 8.0 and a transfer of two electrons and one proton in solutions of pH > 8.0, in agreement with the one-step two-electron mechanism. The cyclic voltammetry indicated that the process of electro-oxidation of DOPAC follows an ErCi mechanism. The standard redox potential, E0′, two-proton-two-electron and one-proton-two-electron processes of DOPAC were determined as 0.585 and 0.357 V versus saturated calomel electrode (SCE), respectively. The acidic dissociation constant of DOPAC was also obtained. Also, the diffusion coefficient of DOPAC was calculated as 9.2 × 10-6 cm2 s-1 for the experimental conditions, using chronoamperometric results. The standard reduction potentials and the second acidic constant of DOPAC have been also calculated using standard ab initio calculations at the G3 level of theory in conjunction with a continuum solvation model. The theoretical values are in good agreement with experiment.",

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author = "Zare, {Hamid R.} and Mansoor Namazian and Coote, {Michelle L.}",

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AU - Namazian, Mansoor

AU - Coote, Michelle L.

PY - 2009/9/30

Y1 - 2009/9/30

N2 - The electrochemical behavior of 3,4-dihydroxyphenylacetic acid (DOPAC) in aqueous solutions with different pHs and DOPAC concentrations was studied by cyclic voltammetry at various potential scan rates. The electro-oxidation of DOPAC involves a transfer of two electrons and two protons in solutions of pH < 8.0 and a transfer of two electrons and one proton in solutions of pH > 8.0, in agreement with the one-step two-electron mechanism. The cyclic voltammetry indicated that the process of electro-oxidation of DOPAC follows an ErCi mechanism. The standard redox potential, E0′, two-proton-two-electron and one-proton-two-electron processes of DOPAC were determined as 0.585 and 0.357 V versus saturated calomel electrode (SCE), respectively. The acidic dissociation constant of DOPAC was also obtained. Also, the diffusion coefficient of DOPAC was calculated as 9.2 × 10-6 cm2 s-1 for the experimental conditions, using chronoamperometric results. The standard reduction potentials and the second acidic constant of DOPAC have been also calculated using standard ab initio calculations at the G3 level of theory in conjunction with a continuum solvation model. The theoretical values are in good agreement with experiment.

AB - The electrochemical behavior of 3,4-dihydroxyphenylacetic acid (DOPAC) in aqueous solutions with different pHs and DOPAC concentrations was studied by cyclic voltammetry at various potential scan rates. The electro-oxidation of DOPAC involves a transfer of two electrons and two protons in solutions of pH < 8.0 and a transfer of two electrons and one proton in solutions of pH > 8.0, in agreement with the one-step two-electron mechanism. The cyclic voltammetry indicated that the process of electro-oxidation of DOPAC follows an ErCi mechanism. The standard redox potential, E0′, two-proton-two-electron and one-proton-two-electron processes of DOPAC were determined as 0.585 and 0.357 V versus saturated calomel electrode (SCE), respectively. The acidic dissociation constant of DOPAC was also obtained. Also, the diffusion coefficient of DOPAC was calculated as 9.2 × 10-6 cm2 s-1 for the experimental conditions, using chronoamperometric results. The standard reduction potentials and the second acidic constant of DOPAC have been also calculated using standard ab initio calculations at the G3 level of theory in conjunction with a continuum solvation model. The theoretical values are in good agreement with experiment.

KW - Ab initio calculations

KW - DOPAC

KW - Electrochemical behavior

KW - G3

KW - Standard redox potentials

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JO - Electrochimica Acta

JF - Electrochimica Acta

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ER -

Experimental and theoretical studies of electrochemical characteristics of 3,4-dihydroxyphenylacetic acid (DOPAC)

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