Cr3+与天冬氨酸在很宽的pH范围内的反应

Yahia Z. Hamada, Nabil Bayakly, M. Shafi, S. Painter, Vanessa Taylor, J. Greene, Khalid Rosli
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引用次数: 4

摘要

在25°C和I=0.10 M NaNO3的宽pH范围(~ 3.5 ~ ~ 10.5)内,采用电位滴定法,天冬氨酸(Asp)与铬金属离子(Cr3+)在溶液中形成金属配合物。浓度分布图显示,在该pH范围内形成的络合物主要为双Cr 3+络合物。利用文献中Cr-Asp配合物的稳定常数值构建浓度分布图。所考虑的配合物有简单的一对一配合物、双配合物和双单质子化配合物,即Cr - Asp、Cr(Asp)2和Cr(Asp)2H。这些复合物对应的Log β值分别为12.46、21.86和24.30。紫外-可见光谱显示cr3 + -Asp结合。紫外可见光谱是在达到高水平平衡状态(平衡时间为50天)的体系中收集的。
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Reactions of Cr3+ with aspartic acid within a wide pH range
Formation of the metal complexes of aspartic acid (Asp) with the chromium metal ion (Cr3+) in solutions using potentiometric titrations is presented within a wide pH range (∼3.5 to ∼10.5) at 25°C and I=0.10 M NaNO3. Concentration distribution diagrams revealed that the main complex formed within this pH range is the bis Cr 3+ complex. Literature stability constant values for the Cr–Asp complexes were used to construct concentration distribution diagrams. Complexes taken into consideration were the simple one-to-one complex, the bis-complex, and the bis-mono-protonated complex, namely, Cr–Asp, Cr(Asp)2, and Cr(Asp)2H. The corresponding Log β values of these complexes were 12.46, 21.86, and 24.30, respectively. UV–Vis spectra demonstrate Cr 3+–Asp binding. The UV–Vis spectra were collected from a system that reached a high level of equilibrium state (50 days’ equilibrium time).
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