Multiwavelength spectrophotometric determination of acidity constants of some azo dyes

被引：16
|
作者：
Shamsipur, Moitaba [1 ]
Maddah, Bozorgmehr [1 ]
Hemmateenejad, Bahram [2 ]
Rouhani, Shohreh [3 ]
Haghbeen, Kamaladin [4 ]
Alizadeh, Kamal [5 ]
机构：
[1] Razi Univ, Dept Chem, Kermanshah, Iran
[2] Shiraz Univ, Dept Chem, Shiraz, Iran
[3] Iran Color Res Ctr, Dept Colorant Manufacture, Tehran, Iran
[4] Natl Res Ctr Genet Engn & Biotechnol, Tehran, Iran
[5] Lorestan Univ, Dept Chem, Khorramabad, Iran
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2008年 / 70卷 / 01期
关键词：
acidity constants; azo dyes; multiwavelength analysis; LFER;
D O I：
10.1016/j.saa.2007.07.006
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
A multiwavelength spectrophotometric titration method was applied to study the acidity constants of some azo dyes in water. The UV-vis absorption spectra of azo dye solutions were recorded in the course of their pH-metric titration with a standard base solution. The protolytic equilibrium constants, spectral profiles, concentration diagrams and also the number of components have been calculated. The quantitative effects of the substituents on the acidity of the studied azo dyes were investigated by the linear free energy relationship (LFER) using Hammet sigma constant (sigma) and field and resonance effects of Kamlet and Taft (f and H, respectively). (C) 2007 Elsevier B.V. All rights reserved.
引用
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页码：1 / 6
页数：6
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