Reduction of palladium(II) monoglycinate complexes at rotating disc palladium electrode in acid media |
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Authors: | T G Nikiforova |
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Institution: | 1.St. Petersburg State University,St. Petersburg,Russia |
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Abstract: | Reduction of palladium(II) glycinate complexes in strongly acid 0.5 M NaClO4 solutions (pH 0.6 and 1.0) with variable palladium(II) complex and free glycine concentration was studied by the taking of
cyclic voltammograms at palladium rotating disc electrode. It is shown that it was a chelate monoglycinate palladium(II) complex
that was present in all studied solutions and underwent the reduction. The diffusion coefficient of the chelate monoglycinate
palladium(II) complex D = (6.5 ± 0.5) × 10−6 cm2/s was determined from the limiting diffusion current of the complex reduction. The monoglycinate palladium(II) complex reduction
occurred in the double-layer segment of the palladium charging curve; it was not complicated by hydrogen adsorption at electrodes.
The palladium(II) complex reduction half-wave potential was determined (E
1/2 = ∼0.300 to 0.330 V (SCE)). It is shown that the decreasing of the number of ligands coordinated by palladium via nitrogen
atom facilitates the complex reduction process. In particular, the reduction potentials of palladium(II) complexes with different
ligand number at palladium electrode shifted markedly toward negative potentials in the series: Pdgly+ < Pd(gly)2 < Pd(gly)42−. |
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