Potentiometric Studies on Binary and Ternary Complexes of Ni(II) and Cu(II) Ions with L-Valine and Paracetamol

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引用次数: 1

Abstract

The protonation constants of the free ligands and the stability constants of binary and ternary complexes of bivalent metal ions of Ni(II) and Cu(II) with a biologically important amino acid of L-valine, Val, and paracetamol, Para, were studied potentiometrically in aqueous solutions at 313.15 ± 0.1 K and a fixed ionic strength of I = 0.10 M NaCl. The complexation model for each system was established using the Irving-Rossotti equation. The formation of the 1:2 or 1:1 binary complexes and 1:1:1 ternary complexes in which the amino acid Val was used as the primary ligand and Para as the secondary ligand, as inferred from the corresponding potentiometric pH-metric titration curves, and their relative stabilities compared to the corresponding ML and ML2 binary complexes are expressed in terms of statistical parameters ∆logK, logK1 and logK2. The complex stability was found to follow the order of Cu(II) > Ni(II). Through these diagnostic studies, it was possible to give the general formula of compounds prepared from amino acids and paracetamol. Amino acid binds to the central ion through oxygen in the hydroxyl group and nitrogen atom in the amine group (-NH2), whereas paracetamol forms a unipolar bond by binding to the concentrated ion through the oxygen atom in the hydroxyl group. Most of the nickel complexes had octahedral symmetry with valine and paracetamol ligands, while the copper complexes had square or hierarchical to square base symmetry.
Ni(II)和Cu(II)离子与l -缬氨酸和扑热息痛的二元和三元配合物的电位学研究
在313.15±0.1 K、固定离子强度I = 0.10 M NaCl条件下,用电位法研究了自由配体的质子化常数以及Ni(II)和Cu(II)二价金属离子与l -缬氨酸Val和对乙酰氨基酚Para的二元和三元配合物的稳定性常数。利用Irving-Rossotti方程建立了各体系的络合模型。根据相应的电位滴定曲线,以氨基酸Val为一级配体,以Para为二级配体的1:2或1:1二元配合物和1:1:1三元配合物的形成,与相应的ML和ML2二元配合物相比,它们的相对稳定性用统计参数∆logK, logK1和logK2表示。络合物的稳定性依次为Cu(II) > Ni(II)。通过这些诊断研究,有可能给出由氨基酸和扑热息痛制备的化合物的一般配方。氨基酸通过羟基上的氧和胺基上的氮原子(-NH2)与中心离子结合,而扑热息痛通过羟基上的氧原子与浓离子结合形成单极键。大多数镍配合物与缬氨酸和扑热息痛配体呈八面体对称,而铜配合物呈正方形或分层到正方形的基对称。
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