Solubilization of Cationic Hemicyanine Dyes in Anionic Surfactant Micelles: A Partitioning Study

摘要

Cationic hemicyanine dyes of the 1-methyl-4-(4-(di-n-alkylamino)-styryl) pyridinium betaintype (alkyl group=methyl to butyl)have been investigated by differential spectroscopy in order to ascertain their solubilization in aqueous micellar solution of sodium dodecylbenzene sulfonate (SDBS). The differential differential absorption spectra were recorded as a function of surfactant concentration at 25.0deg C. Themodynamic prameters were calculated from partition coefficient data. The results show that cationic hemicyanine dyes are solubilized at the micellar surface, indicating an electrostatic interaction between dyes and surfactant micelles.