Determination of binding constants of various alkali metal cations with p-sulfonatocalix[8]arene by using inclusion equilibrium with thionine dye

Yoshimi Sueishi, Hiroe Mori, Naoya Inazumi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The binding constants of various alkali metal cations with water-soluble p-sulfonatocalix[8]arene (Calix-S8) were determined spectrophotometrically by using the inclusion equilibrium of thionine (Th) dye as a chemical indicator. Depending on the kind of alkali metal cations, the inclusion constants of Calix-S8 for Th decrease steeply with an increase in salt concentrations. Alkali metal cations compete with the organic guest Th in the Calix-S8 inclusion. Based on a competitive binding experiment, the binding constants of alkali metal cations with Calix-S8 were evaluated to be 17, 60, and 11 dm6 mol-2 for Na+, K+, and Cs+, respectively. We have demonstrated an absorption-based method of evaluating the binding constants of spectroscopically inert metal cations with Calix-S8 and shown the effects of salts on the molecular recognition of Calix-S8.

Original languageEnglish
Pages (from-to)235-238
Number of pages4
JournalJournal of Inclusion Phenomena and Macrocyclic Chemistry
Volume75
Issue number1-2
DOIs
Publication statusPublished - Feb 1 2013

Keywords

  • Alkali metal cations
  • Binding constant
  • Inclusion complex
  • Phenothiazine dye
  • Water-soluble p-sulfonatocalix[8]arene

ASJC Scopus subject areas

  • Food Science
  • Chemistry(all)
  • Condensed Matter Physics

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