Spectrophotometric determination of acidity constants of 4-(2-pyridylazo)resorcinol in binary methanol-water mixtures

被引：70

作者：

Ghasemi, J ^{[1
]}

Niazi, A

Kubista, M

Elbergali, A

机构：

[1] Razi Univ, Dept Chem, Khorramshahr, Iran

[2] Chalmers Univ Technol, Dept Mol Biotechnol, Gothenburg, Sweden

来源：

ANALYTICA CHIMICA ACTA | 2002年 / 455卷 / 02期

关键词：

4-(2-pyridylazo)resorcinol; principal components; DATAN; acidity constants; binary solvents; solvent mixtures;

D O I：

10.1016/S0003-2670(01)01623-3

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The acidity constants of 4-(2-pyridylazo)resorcinol (PAR, Scheme 1) in binary mixtures of methanol-water at 25 degreesC and an ionic strength of 0.1 M have been determined spectrophotometrically. DATa ANalysis (DATAN) program applied for determination of acidity constants. As percent of methanol increases in solvent mixtures the pK(a) constants also increased. There is linear relationship between acidity constants and the mole fraction of methanol in the solvent mixtures. Effect of solvent composition on acidity constants and pure spectrum of each component are also discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：335 / 342

页数：8

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