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Title: Physico chemical studies on complexation between β-cyclodextrin and cationic surfactants
Authors: Wei, Xilian
Sang, Qing
Yin, Baolin
Sun, Dezhi
Issue Date: Apr-2004
Publisher: NISCAIR-CSIR, India
IPC Code: Inl. Cl.7 G01N
Abstract: Inclusion complexation of β-cyclodextrin (β-CD) with a homologue of new cationic surfactants, 3-alkoxyl-2- hydroxyl propyl trimethyl ammonium chlorides (RmTAC) in aqueous solution have been studied using surface tension measurements at different temperatures. The binding constants of 1:1 complexes have been calculated and important thermodynamic parameters of the inclusion processes are estimated using fundamental thermodynamic equations. Standard change of Gibbs free energy ΔcGmo of every complex process is negative, which indicates that the host-guest inclusion is a spontaneous process. All the values of standard changes of enthalpy and entropy ΔcHmo and ΔcSmo are positive, which shows that the inclusion process is enthalpy-entropy compensational one. However, the entropy effect, TΔcSmo is quite evidently larger than the heat effect ΔcHmo which indicates that the inclusion coordination between β-CD and RmTAC is also entropy driven process, as well as an endoergic driven process.
Page(s): 748-751
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(04) [April 2004]

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