ANYL 18 |
| Solid electrodes modified by an organic phase (polymer, ionic liquid, organic solvent layer) immiscible with water and containing a redox compound, Mo, are often used for the oxidation or reduction of substrates dissolved in aqueous media, in devices for electrosynthesis or electroanalytical purposes. The interfacial potential across the liquid/liquid interface plays a leading role and can be shifted by 0.8 V, using different electrolytes, corresponding to a 77 kJ tremendous change in the electrode reaction Gibbs energy. This will be illustrated by voltammetry of a LuIIIbisphthalocyanine in a thin film of nitrobenzene deposited on a graphite electrode, in the presence of various electrolytes in the organic and aqueous phases. The important influence of the interfacial potential on electrocatalytic processes will be illustrated by the spectacular shifts of the two redox potentials of the bisphthalocyanine and the resulting modification of the catalytic reactions with the aqueous ferri- and ferrocyanide ions. |
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Analytical Approaches: Electroanalytical Chemistry
8:30 AM-11:40 AM, Sunday, 10 September 2006 Moscone Center -- Room 124, Oral
Division of Analytical Chemistry |