SPECTROPHOTOMETRIC INVESTIGATION OF THE FORMATION OF ASSOCIATION COMPLEXES BETWEEN ALIZARIN RED-S AND BETA-CYCLODEXTRIN

被引：4
|
作者：
TAYA, T
FUKUI, N
DOI, K
OTOMO, M
机构：
[1] Department of Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa
来源：
ANALYTICAL SCIENCES | 1991年 / 7卷 / 04期
关键词：
ALIZARIN RED S; BETA-CYCLODEXTRIN; ACID-BASE EQUILIBRIA; INCLUSION COMPLEX; SPECTROPHOTOMETRY;
D O I：
10.2116/analsci.7.627
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The acid-base equilibria of Alizarin Red S (ARS) were investigated spectrophotometrically at 25-degrees-C and mu = 0.2 in the presence of beta-cyclodextrin (beta-CD). In the presence of beta-CD, the dissociation of the first proton (beta-OH) of ARS is slightly enhanced and that of the second one (alpha-OH) is significantly suppressed. All the ionic species of ARS interact with beta-CD to form 1:1 associated complexes, the stabilities of which decrease in the order; HL-HA > H2L-HA > L-HA > L-A, where L and A denote the fully deprotonated form of ARS and the deprotonated form of beta-CD, respectively. The distribution curves for all the species present in the ARS-beta-CD system are given as a function of the pH of the solution.
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页码：627 / 632
页数：6
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