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Title of article :
Molecular recognition of organic anions by a water-soluble calix[4]arene: Evidence for enthalpy–entropy compensation
Author/Authors :
Carmela Bonaccorso، نويسنده , , Antonio Ciadamidaro، نويسنده , , Valeria Zito، نويسنده , , Carmelo Sgarlata، نويسنده , , Domenico Sciotto، نويسنده , , Giuseppe Arena، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2012
Pages :
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Abstract :
The inclusion of organic anions by the water-soluble tetracationic calix[4]arene TAC4 has been studied at neutral pH by 1H NMR and isothermal titration calorimetry. The aromatic anions are better included than their aliphatic analogues. The ΔH° and ΔS° 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.
Keywords :
host–guest complexes , Calixarenes , Aqueous solution , NMR spectroscopy , Enthalpy–entropy compensation , Isothermal titration calorimetry
Journal title :
Thermochimica Acta
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