Determination of acid dissociation constants of some substituted salicylideneanilines by spectroscopy. Application of the Hammett relation

被引：7
|
作者：
Hadjeb, R. [1 ]
Barkat, D. [1 ]
机构：
[1] Biskra Univ, Fac Sci & Technol, Dept Ind Chem, Biskra, Algeria
来源：
ARABIAN JOURNAL OF CHEMISTRY | 2017年 / 10卷
关键词：
Schiff bases; Acidity constant; Substituent effect; Solvent effect; Hammett equation; METHANOL-WATER MIXTURES; SCHIFF-BASES; SPECTROPHOTOMETRIC DETERMINATION; PROTONATION CONSTANTS; CRYSTAL-STRUCTURE; DERIVATIVES; ANTHRAQUINONES; COMPLEXES; PH;
D O I：
10.1016/j.arabjc.2014.04.002
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A series of ten Schiff bases were synthesized by condensation of salicylaldehyde and substituted anilines. The acid dissociation constants (K-a) of salicylideneaniline and methyl-, chloro- and nitro-substituted salicylideneanilines have been determined in ethanol-water and dioxan-water binary mixtures (60% (v/v)) by a spectrophotometric (UV-Vis) method at constant ionic strength and at 25 degrees C. The calculated acidity constants, pK(a) values were evaluated in protonation-deprotonation mechanism. In order to investigate the effects of substituent on the acidity of hydroxy Schiff bases; the applicability of the Hammett equation to the results in two systems of solvent was discussed. (C) 2014 King Saud University. Production and hosting by Elsevier B.V.
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页码：S3646 / S3651
页数：6
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