Mixed-ligand complex formation equilibria of nickel(II) with picolinic acid and some amino acids (glycine, α-alanine, β-alanine, and proline) studied in 1.0 mol•dm-3 NaCl at 25 °C

被引：5

作者：

Paloma Martinez, Diomka ^{[1
]}

Lorena Araujo, Mary ^{[1
]}

Brito, Felipe ^{[1
]}

Perez, Alejandro ^{[2
]}

Hernandez, Lino ^{[2
]}

Lubes, Vito ^{[2
]}

机构：

[1] UCV, Fac Ciencias, Escuela Quim, Ctr Equilibrios Soluc, Caracas, Venezuela

[2] USB, Dept Quim, Caracas 1080 A, Venezuela

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2016年 / 220卷

关键词：

Nickel(II) complexes; Picolinic acid; Potentiometric studies; Speciation; Ternary complexes; IN-VIVO; OXOVANADIUM(IV);

D O I：

10.1016/j.molliq.2016.05.020

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Solution equilibria of the systems Ni(II)-Picolinic acid (HPic)- and the amino acids Glycine (HGly),Proline (HPro), alpha-alanine (H alpha Ala) and beta-alanine (H beta Ala) have been studied pH-metrically. The formation constants of the resulting mixed ligand complexes have been calculated at 25 degrees C and ionic strength 1.0 mol center dot dm(-3) NaCl. Ternary complexes are formed by simultaneous reactions. The relative stability of each ternary complex was compared with that of the corresponding binary complexes in terms of Delta log K '' values. Specie distribution diagrams as a function of pH were briefly discussed. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：681 / 686

页数：6

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