Host-guest complexation of β-, γ-cyclodextrin with alkyl trimethyl ammonium bromides in aqueous solution

被引:18
作者
Qu, Xiu-Kui
Zhu, Lan-Ying
Li, Ling
Wei, Xi-Lian
Liu, Feng
Sun, De-Zhi
机构
[1] Liaocheng Univ, Dept Chem, Shandong 252059, Peoples R China
[2] Liaocheng Univ, Dept Biol, Shandong 252059, Peoples R China
基金
中国国家自然科学基金;
关键词
alkyl trimethylammonium bromides; beta-cyclodextrin; gamma-cyclodextrin; calorimetry; host-guest complex; H-1; NMR;
D O I
10.1007/s10953-007-9132-7
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
As a continuation of our previous investigation, interactions between cyclodextrin (beta-CD), gamma-cyclodextrin (gamma-CD) and alkyl trimethylammonium bromides in aqueous solutions have been studied with titration calorimetry and H-1 NMR at 298.15 K. The results are discussed in terms of the amphiphilic interaction of CD with surfactants and the iceberg structure formed by water molecules existing around the hydrophobic tail of surfactant molecules. The stoichiometry of the beta-CD-surfactant system is 1:1 whereas that of the gamma-CD-surfactant system is 1:2. The corresponding formation enthalpy (negative) of the complexes of the two systems decreases with an increase in the number of carbon atoms (n) in hydrophobic chain of surfactant molecule, CnH2n+1, whereas the entropy increases with the enlargement of n.
引用
收藏
页码:643 / 650
页数:8
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