Ion-pairing co-pigmentation with 4′,7-dihydroxyflavylium studied by pulse light jumps

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Abstract

Pulse light and pH jumps were used to study the structural transformations of the 4′,7-dihydroxyflavylium cation when involved in ion-pairs with the anions chloride, bromide and perchlorate. The association constants of the ion-pairs were calculated by a new approach based on two spectrophotometric titrations; (i) in the absence and. (ii) in the presence of a constant concentration of co-pigment. This method was also used to calculate the ion-pairing association constants of Malvin and the same anions. On the basis of our results, the co-pigmentation model based on the suppression of the hydration reaction in the flavylium complex is questioned.

Original languageEnglish
Pages (from-to)59-64
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume114
Issue number1
DOIs
Publication statusPublished - 31 Mar 1998

Keywords

  • 4′
  • 7-dihydroxyflavylium
  • Co-pigmentation
  • Ion-pairing

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