Complex Formation Study of Binary and Ternary Complexes Including 2,3-Dihydroxybenzoic Acid, N-acetylcysteine and Divalent Metal Ions
Complex Formation Study of Binary and Ternary Complexes Including 2,3-Dihydroxybenzoic Acid, N-acetylcysteine and Divalent Metal Ions
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DOI：
10.1007/s10953-016-0452-3
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发表时间：
2016-03
影响因子：
1.2
通讯作者：
S. Santoso;Artik Elisa Angkawijaya;S. Ismadji;A. Ayucitra;F. Soetaredjo;T. N. P. Lan;Y. Ju
中科院分区：
文献类型：
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作者：
S. Santoso;Artik Elisa Angkawijaya;S. Ismadji;A. Ayucitra;F. Soetaredjo;T. N. P. Lan;Y. Ju
研究了2，3-二羟基苯甲酸（DA）和N-乙酰半胱氨酸（Nac）与二价金属离子（M）Mn 2+、Co 2+、Ni 2+、Cu 2+和Zn 2+在水溶液中的二元和三元络合物稳定常数。使用Hyperquad 2008程序从电位数据中精炼的络合物的稳定常数（log 10 β）表明三元络合物比二元络合物更稳定。稳定性常数得到了额外计算的支持，使用Hypspec程序从分光光度数据中提炼。三元配合物相对于其二元配合物的稳定性（Δ log 10 K）和反硝化常数（log 10 X）的值表明，三元配合物物种[M（DA）（Nac）]3-的形成比由两个相同的配体[M（DA）2]4-或[M（Nac）2]2-形成的物种更有利。对于所研究的M，配合物的稳定性遵循Cu ~（2+）> Zn ~（2+）> Ni ~（2+）> Co ~（2+）> Mn ~（2+）。
The binary and ternary complex stability constants between 2,3-dihydroxybenzoic acid (DA) andN-acetylcysteine (Nac) with the divalent metal ions (M) Mn2+, Co2+, Ni2+, Cu2+and Zn2+were studied in aqueous solution at 310.15 K and an ionic medium of 0.15 mol·dm−3NaCl. The complexes’ stability constants (log10β), refined from the potentiometric data using the Hyperquad2008 program, indicate that the ternary complexes are more stable than the binary complexes. The stability constants were supported by additional computation, refined from the spectrophotometric data using the Hypspec program. The values of the ternary complex stability relative to their binary complex (Δlog10K) and the disproportionation constant (log10X) indicate that formation of ternary complex species [M(DA)(Nac)]3−is more favorable than that of species formed by two identical ligands, [M(DA)2]4−or [M(Nac)2]2−. For the investigated M, the stability of complexes follows the trend Cu2+> Zn2+> Ni2+> Co2+> Mn2+.