Laser photolysis study of the transient products of 4-carboxybenzophenone-sensitized photolysis of chlorophenoxyacetic acid-based herbicides in aqueous micellar solutions

Autor:	Peter P. Levin, O. N. Chaikovskaya, N. B. Sul’timova
Rok vydání:	2010
Předmět:	chemistry.chemical_compound Ketyl Reaction rate constant Quenching (fluorescence) Chemistry Radical Micellar solutions Inorganic chemistry Physical and Theoretical Chemistry Sodium dodecyl sulfate Photochemistry Micelle MCPA
Zdroj:	High Energy Chemistry. 44:393-398
ISSN:	1608-3148 0018-1439
DOI:	10.1134/s0018143910050073
Popis:	The kinetics of the reaction of the triplet states and radicals of 4-carboxybenzophenone (CB) in aqueous sodium dodecyl sulfate micellar solutions in the absence of additives and in the presence of 2,4-dichlorophenoxyacetic acid (DCPA) or 2-methyl-4-chlorophenoxyacetic acid (MCPA) were studied. The rate constants of 3CB quenching by DCPA and MCPA were found to be 8.5 × 105 and 1.4 × 106 s−1, respectively (as calculated for a reactant pair in the micelle). As a result of quenching, radical pairs are produced in the micelle, as well as the ketyl radicals CBH· that lost their partners because of the fast disappearance of some of the DCPA and MCPA radicals. An applied external magnetic field substantially retards the recombination of radical pairs in the micelle.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::649a8853325c6849fc0fd0c033216184 https://doi.org/10.1134/s0018143910050073 Zobrazit plný text záznamu Plný text ve formátu PDF