Spectroscopic study of the complexation of an aza-15-crown-5 containing chromofluoroionophore with Ba2+ and Ca2+ cations

  • N. Mateeva
  • V. Enchev
  • L. Antonov
  • T. Deligeorgiev
  • M. Mitewa
Research Communication

Abstract

The complexation of 1-[(4-benzothiazolyl)phenyl]-4,7,10,13-tetraoxa-1-aza-cyclopenta-decane with Ba2+ and Ca2+ cations was investigated spectrophotometrically and spectrofluorometrically. The stability constants of the complexes formed are: for Ba2+ logKst=3.17±0.01 (absorption) and logKst=2.95±0.03 (fluorescence); for Ca2+ logKst=3.71±0.02 (absorption) and logKst=3.58±0.05 (fluorescence). Protonation of the ligand leads to fluorescence quenching. AM1 and PPP quantum chemical calculations were used to predict molecular geometry, proton affinities and the spectra of the compounds studied.

Key words

Aza-15-crown-5 chromoionophore fluoroionophore complex formation alkali and alkaline earth metal ions 

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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • N. Mateeva
    • 1
  • V. Enchev
    • 2
  • L. Antonov
    • 1
  • T. Deligeorgiev
    • 1
  • M. Mitewa
    • 1
  1. 1.Department of ChemistryUniversity of SofiaSofiaBulgaria
  2. 2.Institute of Organic Chemistry with Centre of PhytochemistryBulgarian Academy of SciencesSofiaBulgaria

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