| Texto completo | |
| Autor(es): |
Ciscato, Luiz Francisco M. L.
[1]
;
Bartoloni, Fernando H.
[1]
;
Colavite, Aline S.
[1]
;
Weiss, Dieter
[2]
;
Beckert, Rainer
[2]
;
Schramm, Stefan
[2]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Santo Andre - Brazil
[2] Univ Jena, Inst Organ Chem & Makromol Chem, D-07743 Jena - Germany
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES; v. 13, n. 1, p. 32-37, 2014. |
| Citações Web of Science: | 18 |
| Resumo | |
The mechanism of the chemiluminescent reaction of ethyl (5-fluoro-2-oxo-2,3-dihydrobenzofuran-3-yl) carbamate (a 2-coumaranone derivative) with a base and molecular oxygen was investigated. New evidence from the reaction kinetics and absorption/emission profiles was obtained, supporting the existence of a 1,2-dioxetanone as an intermediate: (i) its characteristic activation parameters (Delta H-not equal = 7.2 +/- 0.1 kcal mol(-1); Delta S-not equal = -45 +/- 5 cal K-1 mol(-1)) indicating a high degree of thermal instability and (ii) its bimolecular decomposition rate constant for the reaction with perylene. The newly developed methodology has been shown to be suitable for determining the reactivity of such thermally unstable peroxides, which are very difficult to prepare and isolate, using this alternative approach of in situ generation of a 1,2-dioxetanone. (AU) | |
| Processo FAPESP: | 12/02428-5 - Peróxidos orgânicos cíclicos: síntese e mecanismo de redução |
| Beneficiário: | Luiz Francisco Monteiro Leite Ciscato |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 12/13807-7 - Novas ferramentas para o estudo de reações de transferência de elétron em sistemas modelo do PS II |
| Beneficiário: | Fernando Heering Bartoloni |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |