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.

Water Soluble Calix[4]arenes. A Themodynamic Investigation of Proton Complex Formation / G., Arena; R., Cali'; G. G., Lombardo; E., Rizzarelli; D., Sciotto; Casnati, Alessandro; Ungaro, Rocco. - In: SUPRAMOLECULAR CHEMISTRY. - ISSN 1029-0478. - 1:(1992), pp. 19-24. [10.1080/10610279208027437]

Water Soluble Calix[4]arenes. A Themodynamic Investigation of Proton Complex Formation

CASNATI, Alessandro;UNGARO, Rocco
1992-01-01

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.
1992
Water Soluble Calix[4]arenes. A Themodynamic Investigation of Proton Complex Formation / G., Arena; R., Cali'; G. G., Lombardo; E., Rizzarelli; D., Sciotto; Casnati, Alessandro; Ungaro, Rocco. - In: SUPRAMOLECULAR CHEMISTRY. - ISSN 1029-0478. - 1:(1992), pp. 19-24. [10.1080/10610279208027437]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2313414
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