Journal of Research in Applied Chemistry

Author:-Nandini R

Abstract:-The interaction of a cationic dye namely, Pinacyanol chloride (Pcyn) with anionic polyelectrolyte, namely, sodium alginate (NaAlg) has been investigated by spectrophotometric technique. The polymer induced metachromasy in the dye resulting in the shift of absorption maxima of the dye towards shorter wavelengths. The stability of the complex formed between Pcyn and NaAlg was determined by spectral studies. The thermodynamic parameters of interaction namely, KC,ï„G, ï„H &ï„S were evaluated. They suggested a weak met achromatic complex was formed between Pcyn-NaAlg .This fact was further confirmed by reversal studies using alcohols, urea, electrolytes & surfactants. The reversal studies helps in the determination of the stability of the complex and the nature of binding.