Formation constants in the ternary systems Co(II)-L-cysteine-adenine and Zn(II)-L-cysteine-(adenine)2

被引：0
|
作者：
Cücü, K [1 ]
Pekin, M [1 ]
Demir, HD [1 ]
机构：
[1] Univ Marmara, Fac Pharm, Dept Analyt Chem, TR-81010 Istanbul, Turkey
来源：
MAIN GROUP METAL CHEMISTRY | 2000年 / 23卷 / 12期
关键词：
adenine; L-cysteine; cobalt(II) and zinc(II) complexes; mixed complex; stability constants;
D O I：
暂无
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
In the present note, 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 in a given pH region. In addition, the mole 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 degreesC are as follows: logK=9.50 for Co(II)-L-cysteine-adenine; logK(1)=6.85 and logK(2)=6.00 for Zn(II)-L-cysteine-adenine(2). The ionic strength was kept constant at 1=0.20 with NaClO4.
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页码：781 / 787
页数：7
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