title: Evidence of higher complexes between cucurbit[7]uril and cationic surfactants.
abstract: The host-guest assembly of CB7 with a series of alkyl(trimethyl)ammonium (C(n)TA(+)) surfactants of different chain lengths (n=6-18) has been studied. The complexation behaviour was investigated by NMR spectroscopy, isothermal titration calorimetry and kinetics measurements. The combined results of these techniques provided evidence for the formation of 1:1 inclusion and 2:1 external complexes in the cases of C(n)TA(+) with n=12-18. The binding constants for the 1:1 complexes are independent of the alkyl chain length of the surfactant, whereas a relationship between K(2:1) and the chain length of the surfactant was found for the 2:1 complexes.
authors.affiliation: Departamento Química Física, Centro Singular de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago, 15782 Santiago, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Pessêgo
authors.forename: J A
authors.initials: JA
authors.lastname: Moreira
authors.forename: L
authors.initials: L
authors.lastname: Garcia-Rio