ABSTRACT

In this work we report the results of a speciation study on the ternary complexes present in the ternary Ni(II)- 1,10 phenanthroline (Phen)-amino acids and Ni(II)- 2,2-bipyridine (Bipy)-amino acids, with amino acids = aspartic acid (H₂Asp), glutamic acid (H₂Glu), histidine (H₂His) and cysteine (H₂Cys). The analysis involved the use of potentiometric data in 1 M NaCl aqueous solution at 25°C and a least-squares method (LETAGROP). The relative stability of the ternary complexes were compared with the corresponding binary complexes. The concentration distribution of various species formed in aqueous solution were evaluated as a function of pH. The binary complexes in the Ni(II) – Phe and Ni(II) – Bipy systems in 1 M NaCl aqueous solution at 25°C were also studied.

摘要

在这项工作中，我们报告了对三元 Ni(II)-1,10 菲咯啉 (Phen)-氨基酸和 Ni(II)-2,2-联吡啶 (Bipy)-氨基中存在的三元配合物的形态研究结果酸，氨基酸 = 天冬氨酸 (H ₂ Asp)、谷氨酸 (H ₂ Glu)、组氨酸 (H ₂ His) 和半胱氨酸 (H ₂半胱氨酸）。分析涉及在 25°C 下使用 1 M NaCl 水溶液中的电位数据和最小二乘法 (LETAGROP)。将三元配合物的相对稳定性与相应的二元配合物进行了比较。在水溶液中形成的各种物质的浓度分布被评估为 pH 值的函数。还研究了在 25°C 的 1 M NaCl 水溶液中的 Ni(II)-Phe 和 Ni(II)-Bipy 系统中的二元配合物。