Laser flash photolysis study of photosensitized oxidation of phenols in the organized aqueous media

Natalia B. Sultimova; Peter P. Levin; Olga N. Chaikovskaya; Irina V. Sokolova; Alexey V. Kuzmin

doi:10.1117/12.548322

27 February 2004 Laser flash photolysis study of photosensitized oxidation of phenols in the organized aqueous media

Natalia B. Sultimova, Peter P. Levin, Olga N. Chaikovskaya, Irina V. Sokolova, Alexey V. Kuzmin

Proceedings Volume 5396, Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part I: Radiation Propagation in the Atmosphere and Ocean; (2004) https://doi.org/10.1117/12.548322
Event: Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2003, Tomsk, Russian Federation

Abstract

The quenching of triplet 4,4'-dimetylbenzophenone (B) by phenol (PhOH) and its halogen substituted analogs in aqueous micellar solution of sodium dodecyl sulfate as well as formation and decay kinetics of the corresponding radical pairs (RP) have been examined using the laser flash technique. The quenching kinetics was described in terms of PhOH distribution between micellar and aqueous phases. The distribution coefficients and rate constants of intramicellar quenching and PhOH escape from micelles were extracted using global kinetic analysis. A very pronounced internal heavy atom effect was observed for the RP yield and geminate recombination and attributed to the enchanced intersystem crossing within contact RP due to the spin orbital coupling. Application of an external magnetic field results in the RP decay even in the systems with minor contribution of geminate recombination.

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Natalia B. Sultimova, Peter P. Levin, Olga N. Chaikovskaya, Irina V. Sokolova, and Alexey V. Kuzmin "Laser flash photolysis study of photosensitized oxidation of phenols in the organized aqueous media", Proc. SPIE 5396, Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part I: Radiation Propagation in the Atmosphere and Ocean, (27 February 2004); https://doi.org/10.1117/12.548322

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