engleski

Voltammetry of organic microparticles

Solid microparticles of several different insoluble organic compounds were mechanically immobilized on the surface of graphite electrodes and immersed into a liquid electrolyte in order to stady their electrochemical reactions. Cyclic staircase voltammetry and square-wave voltammetry were used. Quinhydrone was found to be a stable intermediate in the reversible redox reaction of solid quinone and hydroquinone on the electrode surface. The reaction occurs on the surface of the solid particle which is in contact with water. Indigo can be reduced to leucoindigo and oxidized to dehydroindigo in two separate reversible redox reactions. In strongly basic medium indigo dissolvs in water upon electroreduction. A hydroacridine radical was detected as a stable intermediate in the electrochemically redox reaction of acridine and dihydroacridine. Famotidine can be electooxidized and the product of this reaction can be electroreduced in two separate chemically irreversible reactions. Probucol is oxidized to a semiquinone radical which can be re-reduced in an electrochemically irreversible redox reaction. Propylthiouracil can be also oxidized to an unknown product which can be re-reduced in a chemically reversible, but slow solid state redox reaction. Reduction of solid thionicotinoylanilide and nicotioylanilide are totally irrevrsible.

solid state voltammetry; quinhydrone; quinone; hydroquinone; indigo; leucoindigo; famotidine; probucol; propylthiouracil; thionicotinoyanilide; nicotinoylanilide

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