Abstract
The kinetics of the electroreduction of palladium(II) complexes with α-alanine are studied on a dropping mercury electrode in solutions containing various supporting electrolytes (NaF, Na2SO4, NaClO4). The study is carried out at variable concentrations of palladium(II) alaninate complexes, the ligand, and the supporting electrolyte, in the pH interval extending from 3 to 11. The obtained values of the half-wave potential for the electroreduction of palladium(II) complexes with α-alanine and the diffusion coefficient for palladium(II) alaninate complexes suggest that, in the acidic and alkaline solutions studied, the slow electrochemical stage involves chelate dialaninate palladium complexes Pd(ala)2. Palladium(II) complexes underwent reduction on the positively-charged surface of DME without any preceding chemical stages. This process was hindered by anions of the supporting electrolyte adsorbed on DME, and in alkaline solutions, by the alaninate ions as well.
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