Water soluble calix[4]arenes. A thermodynamic investigation of proton complex formation
- 1 August 1992
- journal article
- research article
- Published by Taylor & Francis in Supramolecular Chemistry
- Vol. 1 (1) , 19-24
- https://doi.org/10.1080/10610279208027437
Abstract
Thermodynamic parameters of protonation of calix[4]arene-p-tetra sulphonate were potentiometrically and calorimetrically determined in aqueous solution at 25 °C and I = 0.1 mol dm−3 (NaNO3). These values were compared with literature findings. ΔH° and ΔS° values reveal that the penta-anion protonation is energetically costly. In this connection the role played by hydrogen bonding and the cone conformation stabilization are critically discussed. Proton formation constants of the calix[4]arene-p-tetrasulphonate-tetra-carboxylate derivative in the cone conformation were also potentiometrically determined under the same experimental conditions.Keywords
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