The inclusion of organic anions by the water-soluble tetracationic calix[4]arene TAC4 has been studied at neutral pH by H-1 NMR and isothermal titration calorimetry. The aromatic anions are better included than their aliphatic analogues. The DH° and DS° values show that the inclusion processes are mostly enthalpically driven and entropically unfavoured; they also show that an enthalpy-entropy compensation balances the gain in one contribution against a corresponding loss in the other.
Molecular recognition of organic anions by a water-soluble calix[4]arene: evidence for enthalpy–entropy compensation
BONACCORSO, CARMELA
Primo
;SGARLATA, CARMELO;SCIOTTO, Domenico;ARENA, Giuseppe
Ultimo
;
2012-01-01
Abstract
The inclusion of organic anions by the water-soluble tetracationic calix[4]arene TAC4 has been studied at neutral pH by H-1 NMR and isothermal titration calorimetry. The aromatic anions are better included than their aliphatic analogues. The DH° and DS° values show that the inclusion processes are mostly enthalpically driven and entropically unfavoured; they also show that an enthalpy-entropy compensation balances the gain in one contribution against a corresponding loss in the other.File in questo prodotto:
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