Abstract
This study investigated the possible efficient photo-induced interaction of hydrophobic and hydrophilic dyes that were separated by several special micro-environments. The three coumarin dyes as hydrophobic dyes and Rose Bengal B Na + salt (RB) as a hydrophilic dye were chosen as the energy donor and the acceptor in this report. The two kinds of dye molecules can be separated fully in anionic, neutral and cationic micelles, and mixed surfactant vesicles, while energy can be still transferred efficiently from the coumarin dyes to RB. The results showed that the quenched fluorescence of the coumarin dyes by RB does not follow the Stern–Volmer equation, but agrees well with the Perrin formulation, indicating that the energy transfer takes place through Förster's dipole–dipole interaction. The calculated results from Förster's theory reveal that the energy donor and acceptor can interact strongly even if they are separated on the average by about 4–5 nm in these micro-environments.
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