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.
Autori interni: | |
Autori: | POSPISIL L; HANZLIK J; FUOCO R; COLOMBINI M |
Titolo: | ELECTROCHEMICAL AND SPECTRAL EVIDENCE OF THE INCLUSION OF THE HERBICIDE DIFENZOQUAT BY CYCLODEXTRINS IN AQUEOUS-SOLUTION |
Anno del prodotto: | 1994 |
Digital Object Identifier (DOI): | 10.1016/0022-0728(93)03109-3 WC Chemistry, Analytical; Electrochemistry |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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