Electrochemical Behavior of Dopamine and Ascorbic Acid at Osmium(II) Complex Cationic Monolayer Modified Gold Electrodes.

ZHANG Jingdong, JEON Il Cheol

doi:10.2116/analsci.18.1085

Electrochemical Behavior of Dopamine and Ascorbic Acid at Osmium(II) Complex Cationic Monolayer Modified Gold Electrodes.

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ZHANG Jingdong

Department of Chemistry, Chonbuk National University
JEON Il Cheol

Department of Chemistry, Chonbuk National University

書誌事項

タイトル別名

Electrochemical Behavior of Dopamine and Ascorbic Acid at Osmium 2 Complex Cationic Monolayer Modified Gold Electrodes

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説明

The electrooxidation of dopamine (DA) and ascorbic acid (AA) was studied using gold electrodes modified by a cationic self-assembled monolayer of [Os(bpy)₂(bpy-(CH₂)₁₃SH)]²⁺ by cyclic voltammetry. At an [Os(bpy)₂(bpy-(CH₂)₁₃SH)]²⁺/Au electrode, the oxidation peak of DA shifted to a much more positive potential as compared with that of a bare gold electrode, while the oxidation peak potential of AA showed a slightly negative shift due to their different electrostatic interactions with the cationic monolayer. Thus, a sufficient potential difference was achieved for distinguishing the electrochemical responses of DA and AA. However, when CH₃(CH₂)₁₁SH was mixed into the cationic monolayer, the enhanced packing of the mixed monolayer blocked the access of DA or AA to the electrode, resulting in further positive shifts for both oxidation-peak potentials.