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1 Polish Journal of Chemistry

1 2008

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Effect of N,N'-Dimethylthiourea on the Electroreduction of In(III) Ions in Aqueous Perchlorate Solutions at the Mercury Drop Electrodes

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Nosal-Wiercińska A. , Dalmata G.

Polish Journal of Chemistry

2008

tom Vol. 82, nr 7

1473-1473

N,N'-Dimethylthiourea catalyzes electroreduction of In(III) ions on a mercury drop electrodes in an aqueous perchlorate solution in the range 0.5 < pH < 2. The catalytic activity in creases with the in crease of concentration of N,N'-dimethylthiourea. Electroreduction of In(III) ions in the presence of N,N'-dimethylthiourea is a multi-step reaction. The transfer of electrons is preceded by the hy drolysis of In(H2O)6 3+ ions and formation of In–N,N'-dimethylthiourea complexes. These complexes are formed on the electrode surface, because of the significant lo cal N,N'-dimethylthiourea concentration resulting from its adsorption on mercury. The active complexes participate in consecutive transfer of electrons.