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.
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