ELECTROCHEMICAL AND SPECTRAL EVIDENCE OF THE INCLUSION OF THE HERBICIDE DIFENZOQUAT BY CYCLODEXTRINS IN AQUEOUS-SOLUTION

被引：14

作者：

POSPISIL, L ^{[1
]}

HANZLIK, J ^{[1
]}

FUOCO, R ^{[1
]}

COLOMBINI, MP ^{[1
]}

机构：

[1] UNIV PISA, CNR, IST CHIM ANALIT STRUMENTALE, DIPARTIMENTO CHIM, I-56100 PISA, ITALY

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1994年 / 368卷 / 1-2期

关键词：

D O I：

10.1016/0022-0728(93)03109-3

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The 1,2-dimethyl-3,5-diphenyl-pyrazolium cation (the herbicide difenzoquat) forms a weak inclusion complex with beta-clodextrin having the stoichiometry 1:1. The stoichiometry of the complex and the formation constant K = 66 +/- dm3 mol-1 were determined by voltammetry and UV spectroscopy. The reduction product forms a slightly stronger complex than the difenzoquat cation itself. The inclusion of difenzoquat by alpha- and gamma-cyclodextrins is negligible. H-1-NMR data indicate that the guest most probably enters the beta-CD cavity with the pyrazole ring.

引用

页码：149 / 154

页数：6

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