Isoperibolic Titration Calorimetry as a Tool for the Prediction of Thermodynamic Properties of Cyclodextrins

Juan Carlos Moreno-Piraján and Liliana Giraldo
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Juan Carlos Moreno-Piraján: Universidad de los Andes, Bogotá, Colombia, Grupo de Investigación en Sólidos Porosos y Calorimetría, Departamento de Química, Facultad de Ciencias / Carrera 1 No.18 A10, Bogotá, Colombia
Liliana Giraldo: Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Química / Ciudad Universitaria, Bogotá Colombia

Energies, 2008, vol. 1, issue 3, 1-12

Abstract: The interaction of guest molecules ranging from pentan-1-ol to octan-1-ol with ? -cyclodextrin ( ? -CD) in water of has been studied calorimetrically at 283.15, 288.15, 293.15, 298.15 and 308.15 K with an isoperibolic titration calorimeter designed in our laboratory. The calorimetric method employed allows the determination of the thermodynamic parameters characterizing the binding process, ?G° m , ?H° m , ?S° m and ?Cp°, namely free energy, enthalpy, and calorific capacity. These results show that in the temperature range investigated, the entropy change increased with chain length. This is in line with what is expected for a hydrophobic dehydration process. However, that effect is not expected to lead to the more pronounced negative CH 2 -increment observed for n c > 5 or 6. As for many other ligand binding processes, we can observe a significant enthalpy - entropy compensation for this system, both with respect to temperature and structure.

Keywords: Isoperibolic titration calorimetry; Cyclodextrins; Thermodynamic properties (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2008
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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