| Texto completo | |
| Autor(es): |
Vivas, M. G.
;
Germino, J. C.
;
Barboza, C. A.
;
Simon, Deborah de A.
;
Vazquez, P. A. M.
;
De Boni, L.
;
Atvars, T. D. Z.
;
Mendonca, C. R.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Physical Chemistry C; v. 121, n. 2, p. 8-pg., 2017-01-19. |
| Resumo | |
Excited state intramolecular proton transfer (ESIPT) in a novel salicylidene sal-3,4-benzophen chromophore is studied by white-light femtosecond pumpprobe and time-resolved fluorescence techniques, as well as by theoretical calculations under the time dependent density functional theory framework. We show that when the sal-3,4-benzophen chromophore (in enol form) is excited (at 390 nm) to the cis-enol* form, it is quickly converted to the hot cis-keto* (hK*) form due to the fast ESIPT process (tau(ESIPT) = 150 fs). Subsequently, cooling from the hot cis-keto* (hK*) to cold cis-keto* (cK*) state takes place with a characteristic time constant of similar to 600 fs, with following relaxation decay time of 37 ps related with the photodynamic from sal-3,4-benzophen due to the occurrence of the cis -> trans photoisomerization and intersystem crossing mechanisms. Finally, we observed the fluorescence emission from the cis-keto* at 575 nm. The dynamics of the optical process was modeled using rate equations with the proper energy level diagram and supported by theoretical calculations. (AU) | |
| Processo FAPESP: | 13/16245-2 - Propriedades fotofísicas de filmes finos de polímeros conjugados |
| Beneficiário: | Teresa Dib Zambon Atvars |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 09/51602-5 - Biologia química: novos alvos moleculares naturais e sintéticos contra o câncer, estudos estruturais, avaliação biológica e modo de ação |
| Beneficiário: | Ronaldo Aloise Pilli |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 11/12399-0 - Aplicações de pulsos de femtossegundos em óptica não linear: espectroscopia, formatação de pulsos e microfabricação |
| Beneficiário: | Cleber Renato Mendonça |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |