Study of the molecular properties of proflavine, acridine yellow and methylene blue in micellar solutions

摘要

The influence of sodium dodecyl sulphate (SDS) upon molecular properties of proflavine (3,6-diaminoacridine), acridine yellow (2,7dimethyl 3,6-diaminoacridine) and methylene blue (2,7-bis-dimethylaminophenothiazine) was studied comparatively to that of an aqueous medium. The absorption and emission spectra of the three dyes in an anionic surfactant (SDS) aqueous solution (1x10~3 M-1x10~1 M) were recorded. The spectroscopic data also permitted the evaluation of critical micellization concentration (CMC), acidity constants in fundamental (pK_a) and excited (pK~*_a) states, and lifetimes of excited singlet state.