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Redox Kinetics Measurements of Probucole Using Square-Wave Voltammetry

✍ Scribed by Valentin Mircčeski; Milivoj Lovrić; Blagoja Jordanoski

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
92 KB
Volume
11
Category
Article
ISSN
1040-0397

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✦ Synopsis

Probucole is both electroactive and a surface-active compound. It undergoes fast and chemically reversible reduction at a HMD electrode in either 0.1 mol dm À3 KClO 4 or 1 mol dm À3 KNO 3 . Both probucole and its electrode reduction product are strongly adsorbed to the electrode surface and the overall electrode mechanism exhibits characteristic properties of a surface redox reaction. The kinetics of the surface redox reaction of probucole is measured by means of square-wave voltammetry. The kinetic parameters of the redox reaction of probucole were estimated applying the methods of a split SW peak and a quasireversible maximum. In 1 mol dm À3 KNO 3 , the standard rate constant is k s 1400 AE 30 s À1 and the cathodic transfer coef®cient is a 0X55 AE 0X02X

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✍ Šebojka Komorsky-Lovrić; Milivoj Lovrić 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 369 KB

The standard redox reaction rate constants of azobenzene adsorbed to the mercury electrode are k, = 350 + 25 s-' in the acidic perchlorate medium (pH 2) and k, = 175 f 2Os-' in the acetate buffer pH 4.7. Under the influence of 0.2X, 0.5% and 1% acetonitrile in these electrolytes, the rate constants