Isoperibolic Titration Calorimetry as a Tool for the Prediction of Thermodynamic Properties of Cyclodextrins
The interaction of guest molecules ranging from pentan-1-ol to octan-1-ol with <i>α</i>-cyclodextrin (<i>α</i>-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°<sub>m</sub>, ΔH°<sub>m</sub>, ΔS°<sub>m</sub>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<sub>2</sub>-increment observed for n<sub>c</sub> > 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.
Year of publication: |
2008
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Authors: | Moreno-Piraján, Juan Carlos ; Giraldo, Liliana |
Published in: |
Energies. - MDPI, Open Access Journal, ISSN 1996-1073. - Vol. 1.2008, 3, p. 93-104
|
Publisher: |
MDPI, Open Access Journal |
Subject: | Isoperibolic titration calorimetry | Cyclodextrins | Thermodynamic properties |
Saved in:
freely available
Extent: | application/pdf text/html |
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Type of publication: | Article |
Classification: | Q - Agricultural and Natural Resource Economics ; Q0 - Agricultural and Natural Resource Economics. General ; Q4 - Energy ; Q40 - Energy. General ; Q41 - Demand and Supply ; Q42 - Alternative Energy Sources ; Q43 - Energy and the Macroeconomy ; q47 ; Q48 - Government Policy ; Q49 - Energy. Other |
Source: |
Persistent link: https://www.econbiz.de/10011030807
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