| Texto completo | |
| Autor(es): |
Pelosi, Andre Gasparotto
[1]
;
Zucolotto Cocca, Leandro Henrique
[1]
;
Abegao, Luis M. G.
[2]
;
Sciuti, Lucas Fiocco
[1]
;
Piguel, Sandrine
[3, 4]
;
De Boni, Leonardo
[1]
;
Mendonca, Cleber R.
[1]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed Goias, Inst Fis, Grp Foton, BR-74690900 Goiania, Go - Brazil
[3] Univ Paris Saclay, CNRS UMR 9187, INSERM U1196 Chim & Modelisat Biol Canc, F-91405 Orsay - France
[4] Inst Curie, INSERM U1196 Chim & Modelisat Biol Canc, CNRS UMR 9187, F-91405 Orsay - France
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | DYES AND PIGMENTS; v. 198, FEB 2022. |
| Citações Web of Science: | 0 |
| Resumo | |
This work investigates the influence of different electron-withdrawing groups (Cl, Br, fluorobenzonitrile), on the two-photon absorption cross-section of six imidazo{[}4,5-b]pyridine derivatives. The two-photon absorption crosssection spectra were obtained by ultra-fast Z-scan technique from 470 nm up to 700 nm. The Sum-Over-States approach was applied to model the two-photon absorption spectra, using a three-level energy system. Photophysical properties, such as transition dipole moment, the difference of permanent dipole moments, and anisotropy coefficient were determined through the analysis of one-photon absorption spectra, solvatochromism, and fluorescence anisotropy, respectively. Besides, the excited state absorption spectra were measured through ultra-fast transient absorption, allowing the excited state lifetime and spectral position determination. Twophoton absorption cross-sections of about 160 GM were observed when two electron-withdrawing groups are linked to the imidazo{[}4,5-b]pyridine core, elucidating a path to achieve high optical nonlinearities in imidazopyridine derivatives. Furthermore, a increase in the two-photon cross-section was observed when chloride is linked at the C-6 position (90 GM) instead of the C-5 position (50 GM), which is related to the proximity of a higher excited state. (AU) | |
| Processo FAPESP: | 18/11283-7 - Fotônica não linear: espectroscopia e processamento avançado de materiais |
| Beneficiário: | Cleber Renato Mendonça |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |