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首页> 外文期刊>Russian journal of electrochemistry >Reduction of palladium(II) monoglycinate complexes at rotating disc palladium electrode in acid media
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Reduction of palladium(II) monoglycinate complexes at rotating disc palladium electrode in acid media

机译：酸性介质中旋转圆盘钯电极上单甘氨酸钯（II）配合物的还原

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摘要

Reduction of palladium(II) glycinate complexes in strongly acid 0.5 M NaClO_4 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) cm~2/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) _4~(2-) .
机译：通过在钯旋转盘电极上的循环伏安图，研究了在可变酸的钯（II）复合物和游离甘氨酸浓度下在强酸0.5 M NaClO_4溶液（pH 0.6和1.0）中还原甘氨酸钯（II）复合物的方法。结果表明，它是一种螯合的单甘氨酸盐钯（Ⅱ）络合物，存在于所有研究的溶液中并进行了还原。由络合物还原的极限扩散电流确定螯合单甘氨酸盐钯（II）配合物的扩散系数D =（6.5±0.5）×10〜（-6）cm〜2 / s。单甘氨酸盐钯（II）络合物的还原发生在钯带电曲线的双层段中。氢在电极上的吸附并不复杂。测定了钯（II）络合物的还原半波电位（E _（1/2）=〜0.300至0.330 V（SCE））。结果表明，钯经氮原子配位的数量减少促进了络合物的还原过程。特别地，在钯电极上具有不同配体数的钯（II）配合物的还原电势在以下系列中显着地向负电势移动：Pdgly〜+

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