Thermodynamic studies of 2-(5-bromo-2-pyridylazo)5-diethylamino)phenol Cu(II), Co(II), Ni(II) and Zn(II) complexes

被引：9

作者：

Topçu, S ^{[1
]}

Menek, N ^{[1
]}

Eren, E ^{[1
]}

机构：

[1] Ondokuz Mayis Univ, Fac Sci & Arts, Dept Chem, TR-55139 Kurupelit, Turkey

来源：

DYES AND PIGMENTS | 2001年 / 50卷 / 01期

关键词：

complex formation; pyridylazo; stability constant; spectrophotometric;

D O I：

10.1016/S0143-7208(01)00027-4

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The metal-ligand mole ratios and the stability constants of the Cu(II), Co(II), Ni(II) and Zn(II) complexes at 2-(5-bromo-2-pyridylazo)-5-diethylamino)phenol were determined using a spectrophotometric method at different temperatures (20, 30, 40 and 50 +/- 0.1 degreesC) and ionic strengths (0.05, 0.1 and 0.2) in 30% (v/v) aqueous ethanol. Plots of thermodynamic stability constants at zero ionic strength (In K degrees) versus T-1 gave linear curves; the ensuing complex formation (DeltaH degrees and DeltaS degrees) values calculated from these plots. The changes in free energy for each metal-ligand system were evaluated. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：29 / 33

页数：5

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