Abstract
The inclusion complexes of β-CD with sodium octylsulfonate (C8As), sodium dodecyl sulfonate (C12As), andsodium hexadecyl sulfonate (C16As) in aqueous solutions havebeen studied by surface tension measurement at the air/water interfaceand 1H NMR spectroscopy at 323 K.
At fixed concentrations of the surfactants, the surface tensions firstincrease with the increase of β-CD concentrations,then they attain a maximum. The surface tension curves of the surfactantsin the presence of β-CD are higher than those in the absence ofβ-CD. The values increase with increasing β-CD concentrations foreach surfactant. The apparent critical micelle concentrations (CMC) of thesurfactants vary linearly with β-CD concentrations.
A 1H NMR study shows that the signals of theinner H-3 and H-5 of β-CDshift upfield upon addition of the surfactants.The magnitude of the chemicalshift changes (Δδ=δ CDδ obs)varies as a functionof the concentrations of the surfactants. From therelationships between the chemicalshift changes of H-3 or H-5 inside the β-CD cavityand guest/host molar ratios, a 1:1 stoichiometry foreach inclusion complex is assumed. The associationconstants of the inclusion complexes have beendetermined by 1H NMR spectroscopy.
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LU, R., HAO, J., WANG, H. et al. Surface Tension and 1H NMR Studies on Inclusion Complexes of β-Cyclodextrin with Sodium Alkyl Sulfonate. Journal of Inclusion Phenomena 28, 213–221 (1997). https://doi.org/10.1023/A:1007923723044
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DOI: https://doi.org/10.1023/A:1007923723044