Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 73: Issue 2
The effects of increasing NaCl concentration on the stability of inclusion complexes in aqueous solution
Authors:
P. Fini Istituto per i Processi Chimico Fisici (IPCF) CNR, sez. Bari Via Orabona 4 70126 Bari Italy

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M. Castagnolo Universitr di Bari Dipartimento di Chimica Via Orabona 4 70126 Bari Italy

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L. Catucci Istituto per i Processi Chimico Fisici (IPCF) CNR, sez. Bari Via Orabona 4 70126 Bari Italy

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P. Cosma Istituto per i Processi Chimico Fisici (IPCF) CNR, sez. Bari Via Orabona 4 70126 Bari Italy

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A. Agostiano Istituto per i Processi Chimico Fisici (IPCF) CNR, sez. Bari Via Orabona 4 70126 Bari Italy

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Pages:
653–659
Online Publication Date:
31 Oct 2004
Publication Date:
01 Aug 2003
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1025498601192
Keywords:
NaCl; isothermal titration calorimetry; cyclodextrins; inclusion complexes
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Abstract  

Equilibrium constants and standard molar enthalpies of reaction were determined by titration calorimetry for the reaction of 1-butanol with 2-hydroxypropyl-b-cyclodextrin (HP-b-CD) in aqueous solution at different concentrations of NaCl (0-1.9 M). The standard molar free energy and entropy changes associated to the complexation were calculated from the corresponding equilibrium constants, K, and standard enthalpies determined experimentally. In NaCl solutions the inclusion complexes ButOH/HP-b-CD are more stable than in water and their stability increases at increasing NaCl concentration; otherwise, the standard molar enthalpy associated to the formation of the complexes does not change with the increasing of salt concentration. The dependence of K on NaCl concentration were used to evaluate the number of water molecules displaced from the hydration shells of HP-b-CD and ButOH in forming complexes.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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