Fotochemische Primärprozesse von Xanthenfarbstoffen. V. Untersuchungen zum Mizelleinfluß auf die fotochemischen Primärprozesse von Erythrosin

Photochemical Primary Processes of Xanthene Dyes. V. Investigations of the Influence of Micelles on the Photochemical Primary Processes of Erythrosine The triplet state of erythrosine decays in water solution mono- and bimolecularly (k₁ = 0,85 · 10⁴ s⁻¹; k_bi = 7,6 · 10⁸ l/mol s). As results of the bimolecular triplet decay a half-reduced and a half-oxidized form of the dye are observed. The dye ions are localized in the Stern layer of cationic micelles. The triplet state of those dye ions, which are localized individually at micelles, decays only monomolecularly (k = 2,1 · 10³ s⁻¹). If two or more dye ions are localized at a micelle, the bimolecular triplet decay takes place during the flash. Anionic micelles have no influence on the triplet decay processes of erythrosine.