Effect of Beta-Cyclodextrin on the Fluorescence, Absorption and Lasing of Rhodamine 6G, Rhodamine B and Fluorescein Disodium Salt in Aqueous Solutions.

摘要

The fluorescence, absorption and lasing of three xanthene dyes, rhodamine 6G, rhodamine B and the disodium salt of fluorescein were examined in aqueous solutions with and without added Beta-cyclodextrin. Beta-cyclodextrin enhances both fluorescence and lasing for all three dyes in concentrated (.001 M) aqueous dye solutions. In dilute (.00001 to 10 to the -8 power M) aqueous dye solutions, Beta-cyclodextrin can induce either enhancement or quenching of fluorescence and absorption depending on the nature and concentration of the dye. De-aggregation in concentrated solutions and variable complex formation in dilute solutions are proposed to account for the Beta-cyclodextrin-induced effects. Reprints.