STUDY OF THE MOLECULAR-PROPERTIES OF PROFLAVINE, ACRIDINE YELLOW AND METHYLENE-BLUE IN MICELLAR SOLUTIONS

The influence of sodium dodecyl sulphate (SDS) upon molecular properti es of proflavine (3,6-diaminoacridine), acridine yellow (2,7 dimethyl 3,6-diaminoacridine) and methylene blue (3,7-bis-dimethylaminophenothi azine) was studied comparatively to that of an aqueous medium. The abs orption and emission spectra of the three dyes in an anionic surfactan t (SDS) aqueous solution (1 x 10(-3) M - 1 x 10(-1) M) were recorded. The spectroscopic data also permitted the evaluation of critical micel lization concentration (CMC), acidity constants in fundamental(pK(a)) and excited (pK(a)()) states, and lifetimes of excited singlet states .