Abstract
A detailed uv-spectral investigation on the interaction of Direct Sky Blue 6B (C, I. Direct Blue 1) with a cationic polyelectrolyte (methyl-hydroxyethyl-diallylammonium chloride-SO2 copolymer) in dilute aqueous solution has been carried out.
Under appropriate conditions the binding of the dye to the polycation gives rise to a marked change in its spectrum.
When approximately equivalent polycation and dye are present in the solution, the so-called stacking spectrum due to polymolecular adsorption of the dye to the polymer is found. When polycation concentration exceeds largely, the so-called binding spectrum due to monomolecular adsorption of the dye is observed. Complex formation on the polymer between Sky Blue 6B and Chrysophenine G was found.
The effects of urea, caustic soda and sodium chloride on the spectrum of Sky Blue in the presence of the polymer are also discussed.
