INCLUSIONAL COMPLEXES OF DECYLTRIMETHYLAMMONIUM BROMIDE AND BETA-CYCLODEXTRIN IN WATER

被引：59

作者：

JUNQUERA, E ^{[1
]}

AICART, E ^{[1
]}

TARDAJOS, G ^{[1
]}

机构：

[1] UNIV COMPLUTENSE MADRID, FAC CIENCIAS QUIM, DEPT QUIM FIS 1, E-28040 MADRID, SPAIN

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 11期

关键词：

D O I：

10.1021/j100190a074

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 inclusional process of decyltrimethylammonium bromide (DTAB) into the cavity of beta-cyclodextrin (beta-CD) has been studied by measuring speed of sound (u) of aqueous solutions of DTAB in the presence of various constant concentrations of beta-cyclodextrin at 298.15 K. The predominant complex formed has a stoichiometry of 1:1. The apparent critical micellar concentration, cmc* (the cmc for the system DTAB + beta-CD + H2O), is found to increase upon the addition of cyclodextrin, while the concentration of free surfactant available for the micellization process in the presence of beta-CD ([DTAB]f) increases slightly. The binding or association constant of the complexation equilibrium is evaluated from u measurements by using a nonlinear regression method. The resulting K value is analyzed and compared with those given by other researchers and the discrepancies are discussed.

引用

页码：4533 / 4537

页数：5

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