pH-Metric Studies of Acid-Base Equilibria on the mixed Cu( II) Complexes with Pyrazine-2,3-Dicarboxylic Acid and Amino Acids

被引：0

作者：

Ammar, Reda A. ^{[1
,2
]}

Nafady, Ayman ^{[1
,3
]}

Amin, Mona F. ^{[2
]}

Al-Mogren, Muneerah M. ^{[1
]}

Shoukry, Eman M. ^{[2
]}

机构：

[1] King Saud Univ, Dept Chem, Fac Sci, Riyadh, Saudi Arabia

[2] Al Azhar Univ, Fac Sci, Dept Chem, Cairo, Egypt

[3] Sohag Univ, Dept Chem, Fac Sci, Sohag, Egypt

来源：

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE | 2013年 / 8卷 / 01期

关键词：

Stability constant; Acid-Base Equilibria; Pyrazine-2,3-dicarboxylic acid; Mixed ligand; Cu(II) complexes; SPECTROSCOPIC CHARACTERISTICS; MAGNETIC-PROPERTIES; THERMAL-PROPERTIES; COPPER(II); COBALT(II); CONSTANTS; PYRAZINE; OXOVANADIUM(IV); DISSOCIATION; NICKEL(II);

D O I：

暂无

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this study, acid-base equilibria involved in the complex formation of Copper (II) ion with pyrazine-2,3-dicarboxylic acid (PDC) and amino acids (L) ligands have been determined potentiometrically in 20% (v/v) ethanol-water mixture, at 25 degrees C and an ionic strength (I) of 0.10 mol/L (NaClO4). The relative stabilities of the ternary complexes are compared with those of the corresponding binary complexes in terms of Delta log K values. Importantly, the possible formation of mixed-ligand complexes by simultaneous mechanisms has been confirmed by comparison with constructed theoretical curves. Additionally, species distributions in solution for all complexes were precisely evaluated. pH-studies of these systems clearly indicate that the concentration of the ternary complexes increases with increasing pH. This behaviour attests that complex formation is more favoured in physiological pH range (6-7), whereas protonated ternary complexes become highly favourable at lower pH's.

引用

页码：1501 / 1510

页数：10

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