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.

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

FUOCO, ROGER;COLOMBINI, MARIA PERLA
1994

Abstract

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.
Pospisil, L; Hanzlik, J; Fuoco, Roger; Colombini, MARIA PERLA
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/205668
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 15
  • ???jsp.display-item.citation.isi??? 14
social impact