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

Author

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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)

Abstract

The interaction of guest molecules ranging from pentan-1-ol to octan-1-ol with α -cyclodextrin ( α -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, ΔG° m , ΔH° m , ΔS° m and ΔCp°, 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.

Suggested Citation

  • Juan Carlos Moreno-Piraján & Liliana Giraldo, 2008. "Isoperibolic Titration Calorimetry as a Tool for the Prediction of Thermodynamic Properties of Cyclodextrins," Energies, MDPI, vol. 1(3), pages 1-12, October.
    • Handle: RePEc:gam:jeners:v:1:y:2008:i:3:p:93-104:d:3286
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    Cited by:

    1. José Eli Eduardo González-Durán & Juvenal Rodríguez-Reséndiz & Juan Manuel Olivares Ramirez & Marco Antonio Zamora-Antuñano & Leonel Lira-Cortes, 2020. "Finite-Element Simulation for Thermal Modeling of a Cell in an Adiabatic Calorimeter," Energies, MDPI, vol. 13(9), pages 1-12, May.

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