Luminescence properties of acridine dyes in micellar sodium dodecyl sulfate solutions containing thallium ions

The effect of external "heavy" TI1 ion on the luminescence properties of Tr ypaflavine, Acridine Yellow, and Acridine Orange solubilized in sodium dode cyl sulfate micelles was studied. An increase in the concentration of thall ium ions results in a decrease in the intensity of prompt fluorescence, an increase in the intensity of delayed fluorescence, the appearance of phosph orescence at similar to 20 degreesC, and a shortening of the triplet state lifetime of the dyes. The effective and micellar Stern-Volmer constants of fluorescence quenching of the dyes by thallium ions were determined. The ef fective and micellar quenching rate constants of triplet states of the dyes by TI(1) ions and lifetimes of the triplet states of the dyes in the absen ce of thallium ions were calculated on the basis of kinetic measurements.