Abstract
The visible spectra of safranine T (ST) in micellar solutions of Brij 52, Brij 56 and Brij 58 indicate 1 : 1 charge transfer complex formation of ST with non-ionic Brij micelles. The complexing strength follows the order Brij 52 > Brij 56 > Brij 58. The fluorescence spectra of ST in micellar solutions of Brij also support 1 : 1 ST-micelle complex formation as in the ground state. The equilibrium constant of the dye—micelle complex is directly proportional to the micellar aggregation number and inversely proportional to the surfactant critical micellar concentration (CMC). The solvent parameters, i.e. the Kosower Z value, intramolecular charge transfer energy E T 30 and dielectric constant of the micellar medium, were evaluated. The binding constant, micellar aggregation number and solvent parameters remain constant over a certain range of Brij concentration, but vary beyond this range.
Published Version
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