Abstract
The interaction of both cationic dye Safranine T (ST) and anionic dye Congo red (CR) with anionic and cationic surface active ionic liquid 1-butyl-3-methyl imidazolium octyl sulphate ([BMIM] [OS]) and 1-decyl-3-methyl imidazolium chloride ([DMIM] [Cl]) has been investigated by absorbance and emission spectroscopy, time resolved fluorescence study and anisotropy method at premicellar and post micellar region. The interaction of dye with both the ionic liquids occurred electrostatically as well as hydrophobically. In case of ST, initially absorbance decreases up to a certain concentration without any shift of λmax, and then it increases with red shift of λmax. Absorption spectra of CR gave red shifted wavelength with addition of [BMIM] [OS], but at higher concentration of surface active ionic liquid [SAIL], no shifting was observed. Again, blue shifted λmax was found in lower range of [DMIM] [Cl]; but at higher concentration, it was further red shifted. Emission intensity increases in both dye-SAIL systems;...
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