Formation constants in the ternary systems: Co(II)-L-cysteine - Adenine & Zn(II)-L-cysteine-Adenine

被引：0
|
作者：
Cücü, A.K. [1 ]
Pekin, M. [1 ]
Demir, H.D. [1 ]
Aboul-Enein, H.Y. [1 ]
机构：
[1] Pharmaceutical Analysis Laboratory, Biological Research Dept. (MBC-03), King Faisal Spec. Hosp./Res. Centre, P.O. Box 3354, Riyadh 11211, Saudi Arabia
来源：
Toxicological and Environmental Chemistry | 2001年 / 80卷 / 3-4期
关键词：
DNA - pH - Ternary systems - Titration;
D O I：
10.1080/02772240109359007
中图分类号：
学科分类号：
摘要：
A potentiometric titration technique has been used to determine stability constants for the various complexes of Co(II) and Zn(II) with L-cysteine and from DNA bases i.e. Adenine. Stability constants of ternary systems have been evaluated by the method suggested by Irwing-Rossotti. In addition, the conditional constants were calculated as a function of pH. The maximum values of the conditional formation constants were found to be in accordance with the mixed-ligand complex formation constants at a given pH region. Furthermore, the molar fractions of different species from mixed complexes were calculated by means of formation constants. The values of stability constants of mixed-ligand complexes at 25°C are as follows: log K=9.50 for Co(II)-L-cysteine-Adenine; log K1 = 6.85 and log K2 = 6.00 for Zn(II)-L-cysteine-Adenine2. The ionic strength was kept constant at I = 0.20 with NaClO4.
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页码：165 / 174
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