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首页> 外文期刊>International Journal of Electrochemical Science >pH-Metric Studies of Acid-Base Equilibria on the mixed Cu(II) Complexes with Pyrazine-2,3-Dicarboxylic Acid and Amino Acids
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pH-Metric Studies of Acid-Base Equilibria on the mixed Cu(II) Complexes with Pyrazine-2,3-Dicarboxylic Acid and Amino Acids

机译：与吡嗪-2,3-二羧酸和氨基酸混合的Cu（II）配合物的酸碱平衡的pH度量研究

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摘要

In this study, acid-base equilibria involved in the complex formation of Copper (II) ?ion with pyrazine-2,3-dicarboxylic acid ?(PDC) and amino acids (L) ligands have been determined potentiometrically in20% (v/v) ethanol-water mixture, at 25 ?C and an ionic strength (I) of 0.10 mol/L (NaClO4). Therelative stabilities of the ternary complexes are compared with those of the ?corresponding binarycomplexes in terms of Δ log K values.?Importantly, the possible formation of mixed-ligand complexesby simultaneous mechanisms has been confirmed by comparison with constructed theoretical curves.Additionally, species distributions in solution for all complexes were precisely evaluated. pH-studiesof these systems clearly indicate that the concentration of the ternary complexes increases withincreasing pH. This behaviour attests that complex formation is more favoured in physiological pHrange (6-7), whereas protonated ternary complexes become highly favourable at lower pH’s.
机译：在这项研究中，电位计以20％（v / v）的电位测定了参与铜（II）离子与吡嗪-2,3-二羧酸（PDC）和氨基酸（L）配体的复杂形成的酸碱平衡。乙醇-水混合物，温度为25°C，离子强度（I）为0.10 mol / L（NaClO4）。将三元络合物的相对稳定性与相应的二元络合物的相对稳定性用Δlog K值进行了比较。重要的是，通过与构建的理论曲线进行比较，证实了同时机制可能形成的混合配体络合物。精确评估了溶液中所有络合物的溶解度。这些系统的pH值研究清楚地表明，三元配合物的浓度在pH值增加的范围内增加。这种行为证明在生理pH范围（6-7）中更倾向于形成复合物，而质子化的三元复合物在较低pH值下变得非常有利。

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