Interaction of UO22+ with Sodium Dodecyl Sulfate Micelles: Association of Phenols to Micelles through Fluorescence Quenching Data

Kinetics of fast reactions of triplet states and radicals under photolysis of 4,4′-dimethylbenzophenone in the presence of 4-halophenols in micellar solutions of sodium dodecyl sulfate in magnetic field

“…In this case, the k q and k -values were varied, and k + for all phenols was accepted equal to a typical value of 5•10 9 L mol -1 s -1 . 19 The resulting k q values, as well as in several organic solvents or in water, 16-18 are only insignificantly lower Table 1. Rate constants of quenching of the triplet state of 4,4´ dimethylbenzophenone with phenols 4 RC 6 H 4 OH (k q ), escape of phenols and phenoxyl radicals from micelles (k -and k e , respectively), and radical recombination in micelles (k r ) in the zero magnetic field and at B = 0.2 T, the quantum yields of radicals (ϕ R ), and the partition constants of phenols between the micellar and aqueous phases (P MW )* than the diffusion limit (typical collision frequencies for a pair of aromatic reactants in SDS micelles are ν d = (2-5)•10 7 s -1 ).…”

“…A study of the quenching kinetics of the triplet state of a photosensitizer localized in the micellar phase by molecules of hydrophilic phenols, which are distributed between the aqueous and micellar phases, also provides information on the partition con stants. 19 The kinetics of fast processes during photooxida tion of water soluble halosubstituted phenols is also worthy of attention because of the problem of industrial sewage decontamination.In this work, nanosecond laser photolysis was used to study the kinetics of quenching of the triplet state of 4,4´ dimethylbenzophenone (DB) with para substituted phenols RC 6 H 4 ОН (R = Н, F, Сl, Br, I) in aqueous micellar solutions of sodium dodecyl sulfate (SDS). The kinetic data were processed by the global analysis method in the framework of a model with the Poisson distribution of RC 6 H 4 ОН between micelles.…”

“…A study of the quenching kinetics of the triplet state of a photosensitizer localized in the micellar phase by molecules of hydrophilic phenols, which are distributed between the aqueous and micellar phases, also provides information on the partition con stants. 19 The kinetics of fast processes during photooxida tion of water soluble halosubstituted phenols is also worthy of attention because of the problem of industrial sewage decontamination.…”