Presence Of Anionic Micelles Research Articles

Fotochemische Primärprozesse von Xanthenfarbstoffen. VIII. Zum Einfluß von gemischten Mizellen auf die fotochemischen Primärprozesse von Selenopyronin und Erythrosin sowie die sensibilisierte Diazoniumsalzfotolyse

Photochemical Primary Processes of Xanthene Dyes. VIII. Influence of Mixed Micelles on the Photochemical Primary Processes of Selenopyronine and Erythrosine and the Sensitized Photolysis of Diazonium SaltsThe influence of the nonionic detergent dodecyltriglycol (DTG) on the escape rate of dye ions from cationic and anionic micelles is investigated. The rate constant of the escape of selenopyronine ions (Sp⊕) from mixed micelles of sodium dodecylsulfate (NDS) and DTG (1:1) (kA ≈︁ 3,2 · 104 s−1) is, as a result of the lower charge density, higher by the factor 10 than that from clean NDS‐micelles (kA ≈︁; 2,8 · 103 s−1). Erythrosine ions (Et2⊖) are tightly fixed to cetyltrimethylammoniumbromide (CTAB)‐micelles (kA ≈︁; 0,25 · 103 s−1) and to mixed micelles of CTAB and DTG (1:1). This may be a result of the twofold negative charge of the erythrosine ions. Properties of the mixed micelles (polarity, average aggregation numbers) are determined by using the dyes and pyrene as probes. The sensitized photolysis of diazonium salts by electron transfer from photoexited selenopyronine under aerobic conditions is more effective by a factor of 3–5 in the presence of anionic micelles than when in a water solution.

Micelle studies using a metal ion/murexide indicator system

Complex formation between divalent metal ions and the hydrophilic murexide anion in the presence of anionic micelles has been employed to study aspects of micelle formation, the binding of divalent metal ions to micelles, and the kinetics of metal-complex formation in the presence of micelles.

Energy Transfer in Micellar Systems. Fluorescence Investigation of Energy Transfer from Dialkylalloxazine to Dye Cations in the Presence of Anionic Micelles

AbstractThe energy transfer from photoexcited 1,3‐dioctylalloxazine (DOA) to dye cations (proflavine, PF+, and acriflavine, AF+) has been investigated in aqueous solutions containing anionic sodium dodecyl sulfate, SDS, micelles. The energy transfer efficiency smoothly varies with the concentration of SDS above the critical micelle concentration of SDS. The experimental data can be interpreted in terms of the probability of binding both donor and acceptor molecules in the same micelle. The singlet energy of the excited donor at the micelle interior appears to be efficiently delivered to the acceptor cation at the micellar surface by the Förster‐type induced resonance mechanism.