Halide-sensitive Fluorescent Probes for Self-assembly of Novel Cationic Fluorosurfactants

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Examination was made of the properties of aqueous solutions of cationic fluorosurfactants based on data for the fluorescence quenching of quinoline and acridine derivatives. The fluorosurfactant possessing a chloride counterion gave higher CMC and micellar counterion dissociation compared with those containing bromide. Micellar counterion dissociation was noted to slightly decreased with increase in NaCl but significantly to do so to less than 30 and 75 mM NaCl for C₈F₁₇CH₂CH(OH)CH₂NH(C₂H₅)₂Cl and C₈F₁₇CH₂CH₂NC₅H₅ Cl, respectively. Change in 6-methoxy-N-(3-sulfopropyl)quinolinium (SPQ) fluorescence spectra with hydrogenation served as basis for determining the site of solubilization in micellar solution. Dissolved SPQ in water bulk phase underwent instant reduction with the addition of NaBH₄, though SPQ in fluorosurfactant systems showed virtually no reduction owing to solubilization of SPQ in vesicles.