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Inclusion of the herbicide difenzoquat (1,2-dimethyl-3,5-diphenyl-pyrazolium) byβ-cyclodextrin in aqueous solution

  • L. Pospíšil
  • M. P. Colombini
Article

Abstract

The herbicide difenzoquat, 1,2-dimethyl-3,5-diphenyl-pyrazolium methylsulphate, forms a weak inclusion complex with βCD having 1 : 1 stoichiometry and a formation constant ofK=70±12 mol−1 L. The complexation changes the solution conductivity and substantially enhances the fluorescence intensity. The probable configuration of the inclusion complex is the insertion of the pyrazole ring into the cavity, leaving both phenyl substituents outside.

Key words

Cyclodextrin difenzoquat pyrazolium fluorescence conductivity complex 

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • L. Pospíšil
    • 1
  • M. P. Colombini
    • 2
  1. 1.The J. Heyrovský Institute of Physical Chemistry and ElectrochemistryThe Academy of Sciences of the Czech RepublicPragueCzech Republic
  2. 2.Dipartimento di ChimicaUniversita degli StudiPisaItaly

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