Autor(es)

Souza, Glalci A. ; Lang, Andre P. ; Baader, Wilhelm J.

• Tipo de documento: Artigo Científico
• Fonte: Photochemistry and Photobiology; v. 93, n. 6, p. 7-pg., 2017-11-01.

Resumo

Mechanistic studies on the peroxyoxalate chemiluminescence are often conducted with imidazole as base and nucleophilic catalyst. However, it is also known that this compound, at high concentrations, leads to a drastic reduction in the chemiluminescence quantum yields, apparently due to the destruction of the high-energy intermediate. Consequently, the search for new catalysts for this transformation is of importance for mechanistic studies as well as analytical application. Therefore, we report here a study on the mechanism of the peroxyoxalate reaction with sodium salicylate as base catalyst, which has already been utilized in this reaction; however, no detailed mechanistic investigation is known. In this work, a kinetic study on the sodium salicylate-catalyzed reaction of bis(2,4,6-trichlorophenyl) oxalate with hydrogen peroxide using 9,10-diphenylanthracene as activator is reported, where observed rate constants, singlet quantum yields and activation parameters are determined in different reaction conditions, leading to the formulation of a general mechanistic reaction scheme. (AU)

• Processo FAPESP: 14/22136-4 - Uso de solventes verdes e suas misturas na otimização de processos químicos
• Beneficiário: Omar Abou El Seoud
• Modalidade de apoio: Auxílio à Pesquisa - Temático