Ac polarography and faradaic impedance of strongly adsorbed electroactive species: Part IV. Experimental study of the faradaic impedance of the redox systems benzo(c)cinnoline-dihydrobenzo(c) cinnoline |
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| Authors: | D Lelievre V Plichon E Laviron |
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| Institution: | Laboratoire de Chimie Analytique des Milieux Réactionnels Liquides, 10, rue Vauquelin-75231 Paris Cédex 05, France;Laboratoire de Polarographie Organique associé au C.N.R.S. (LA 33), Faculté des Sciences Gabriel, 6; Boulevard Gabriel 21000 Dijon, France |
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| Abstract: | The faradaic impedance of the surface redox system benzo(c)cinnoline-dihydrobenzo(c)-cinnoline is studied experimentally in aqueous medium between pH 5 and 13. The variations of the impedance components are in good accord with the theoretical predictions. A V-shaped curve is found for log ks=f(pH) (ks=rate constant of the surface electrochemical reaction). It is estimated that the determination of rate constant values up to 2×104 s?1 on a mercury electrode is possible by this method. |
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