Thin Solid Films, Vol.346, No.1-2, 145-149, 1999
A spectroscopic study of hemicyanine dyes in anionic micellar solutions
The interaction of amphiphilic hemicyanine dyes i.e. (dialkylamino)stilbazolium butyl sulphonate (R = -CH3 to -C5H11) With sodium dodecyl sulphate (SDS), an anionic surfactant, in the process of solubilization was studied by absorption spectra as a function of surfactant concentrations above and below critical micelle concentration. Absorption spectra showed a red shift for dyes with small dialkyl chains and a blue shift for dyes with long dialkyl chains. Electronic transition energies (Delta E-T) and the approximate number of dye molecules incorporated per micelle were estimated at particular surfactant concentrations. Hydrophobic-hydrophilic force balance plays an important role in the process of solubilization of dyes in aqueous micellar solution.
Keywords:FLUORESCENCE;SURFACTANT