Abstract
A novel imidazolium-based chiral surfactant with a Y-type hydrophobic chain, (S)-(+)-1-(2,3-bis(octanoyloxy)propyl)-3-methylimidazolium chloride ([Bopmim]Cl), was synthesized. The aggregation behavior of [Bopmim]Cl in aqueous solution was then investigated by surface tension, electrical conductivity, 1H NMR, and fluorescence measurements. Compared with [C12mim]Cl, the critical micelle concentration for [Bopmim]Cl is lower, indicating that the novel chiral surfactant has superior capacity to form micelles. A larger value of pC 20, a greater minimum area per surfactant molecule (A min), a smaller degree of counterion binding (β), and a looser aggregate are caused by the relatively larger Y-type hydrophobic chain of [Bopmim]Cl. Furthermore, analysis of the 1H NMR spectra revealed that the introduced Y-type hydrophobic chain may prevent the hydrophobic group from forming an extended chain configuration and cause a changeover from trans to gauche conformations upon micellization. The micelles of the novel chiral surfactant may provide some potential applications in the stereochemical recognition of surfaces or of biological structures.
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Acknowledgments
The authors are grateful to the National Natural Science Foundation of China (No. 50972080 and No. 91127017) and the National Basic Research Program (2009CB930101).
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Gao, H., Shi, L., Zhang, S. et al. Aggregation behavior of imidazolium-based chiral surfactant in aqueous solution. Colloid Polym Sci 291, 1077–1084 (2013). https://doi.org/10.1007/s00396-012-2830-8
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DOI: https://doi.org/10.1007/s00396-012-2830-8