MICROCALORIMETRIC TITRATION OF ALPHA-CYCLODEXTRIN WITH SOME STRAIGHT-CHAIN ALPHA,OMEGA-DICARBOXYLATES IN AQUEOUS-SOLUTION AT DIFFERENT TEMPERATURES

被引：21

作者：

GOMEZORELLANA, I ^{[1
]}

HALLEN, D ^{[1
]}

STODEMAN, M ^{[1
]}

机构：

[1] LUND UNIV,CTR CHEM,S-22100 LUND,SWEDEN

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1994年 / 90卷 / 22期

关键词：

D O I：

10.1039/ft9949003397

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The complex formation of alpha-cyclodextrin and straight-chain aliphatic alpha,omega-dicarboxylates, -O2C(CH2)nCO2-(n = 6, 7, 8), in aqueous solution has been studied by titration microcalorimetry at 288.15, 298.15 and 308.15 K. Apparent Gibbs energies, enthalpies, entropies and heat capacities for the 1 : 1 complex formations were derived from the calorimetric data. The thermodynamics of binding show typical enthalpy-entropy compensation effects, which result in weak temperature dependences of the Gibbs energies. The heat capacities of binding are large and negative. This confirms the view that the binding of non-polar moieties to cyclodextrins is to a large extent a result of hydrophobic dehydration. Experimental conditions causing deviations from the 1 : 1 model, are also discussed.

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页码：3397 / 3400

页数：4

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