Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
A Precise Calorimetric Study of 18-Crown-6 Complexes with Sodium, Potassium, Rubidium, Caesium, and Ammonium Ions in Aqueous Solution
Kazuhiko OzutsumiShin-ichi Ishiguro
Author information

1992 Volume 65 Issue 4 Pages 1173-1175


The complexation of 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6) with sodium, potassium, rubidium, caesium, and ammonium ions has been studied by precise titration calorimetry in aqueous solution containing 0.1 mol dm−3 (C2H5)4NCl as a constant ionic medium at 25 °C. The calorimetric data were well explained in terms of the formation of the [M(18-crown-6)]+ (M = Na+, K+, Rb+, Cs+, and NH4+) complexes, and their formation constants, enthalpies, and entropies were determined. The thermodynamic parameters of the complexes thus obtained are discussed in relation to their structures in solution.

Information related to the author

This article cannot obtain the latest cited-by information.

© 1992 The Chemical Society of Japan
Previous article Next article