Thermodynamic study for dicyclohexano-24-crown-8 complexes with K+, Rb+, Cs+ and Tl+ ions in binary acetonitrile–nitromethane mixtures by conductometric method

  • Mohammad Kazem Rofouei
  • Mehdi Taghdiri
  • Mojtaba Shamsipur
Original Article
First Online:
Received:
Accepted:

Abstract

The complexation reactions between dicyclohexano-24-crown-8 (DC24C8) and K+, Rb+, Cs+ and Tl+ ions were studied conductometrically in the different acetonitrile-nitromethane mixtures at various temperatures. The formation constants of the resulting 1:1 complexes were calculated from the computer fitting of the molar conductance-mole ratio data at different temperatures. At 25 °C and in all solvent mixtures used, the stability of the resulting complexes varied in order of Tl+ > K+ > Rb+ ~ Cs+. The enthalpy and entropy changes of the complexation reactions were evaluated by the temperature dependence of formation constants. It was found that the stability of the resulting complexes increased with increasing nitromethane in the solvent mixture.

Keywords

Dicyclohexano-24-crown-8 K+, Rb+, Cs+ and Tl+ complexes Conductance Stability Mixed solvent 
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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Mohammad Kazem Rofouei
    • 1
  • Mehdi Taghdiri
    • 2
  • Mojtaba Shamsipur
    • 3
  1. 1.Department of ChemistryTarbiat Moallem UniversityTehranIran
  2. 2.Department of ChemistryPayame Noor UniversityArdakan, YazdIran
  3. 3.Department of ChemistryRazi UniversityKermanshahIran

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