Thermodynamics and stability of Co2+, Ni2+, Cu2+ and Zn2+ complexes with DL-2-amino butanedioic acid

被引：0
|
作者：
Soni, Sharda [1 ]
Gupta, K. D. [2 ]
机构：
[1] Swami Keshvanand Inst Technol, M&G, Dept Chem, Jaipur 302025, Rajasthan, India
[2] Malaviya Natl Inst Technol, Dept Chem, Jaipur 302017, Rajasthan, India
来源：
ORIENTAL JOURNAL OF CHEMISTRY | 2010年 / 26卷 / 01期
关键词：
Thermodynamics; stability of Co2+; Ni2+; Cu2+ and DL-2-amino butanedioic acid;
D O I：
暂无
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
pH metric titration technique has been employed to study the formation and composition of complexes of divalent Co, Ni, Cu and Zn with DL-2-amino butanedioic acid. Formation curve reveals the formation of 1: 1 and 1: 2 metal ligand complexes in the pH range 4.30-8.85. Their stability constant have been determined at 20 degrees C, 30 degrees C and 40 degrees C and a different ionic strength viz. 0.05M, 0.1M, 0.15M and 0.2M NaClO4 by Irving Rossotti method which follow the order Co2+ < Ni2+ < Cu2+ > Zn2+ which is in agreement with Irving Williams series. The change in thermodynamic parameter Delta G, Delta H and Delta S accompanying complexation have been evaluated at 30 degrees C. The stability constant and thermodynamic function of these metal complexes are discussed in relation to ionic radii, electronegativity and ionization potential of title metals.
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页码：87 / 91
页数：5
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