| Texto completo | |
| Autor(es): Mostrar menos - |
Antoneli, Rafael G.
;
Moraes, Thaisa B. F.
;
Junqueira, Helena C.
;
Sihn, Luca M.
;
Toma, Henrique E.
;
Pedras, Bruno
;
Ferreira, Luis F. V.
;
Frath, Denis
;
Bucher, Christophe
;
Steed, Jonathan W.
;
Demets, Gregoire J. -F.
;
Triboni, Eduardo R.
Número total de Autores: 12
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF MATERIALS CHEMISTRY C; v. 12, n. 11, p. 9-pg., 2024-02-23. |
| Resumo | |
Naphthalenediimide amphiphiles (NDI-as) with quaternary ammonium groups (DC4, DaP, and DaO) display unprecedented UV light-induced aggregation in solutions of water, acetonitrile and THF. Light-induced aggregation brings significant spectral modification by which unusual absorption band distribution is assigned to H-type aggregates. Such aggregation can be reversibly broken by heating and reassembled by photoirradiation. The irradiation/heating cycles that provoke assembly/disassembly process can be confirmed by 1H-NMR spectroscopy. The possibility of a chemically promoted aggregation by or radical anion either anion-pi interaction may be ruled out by UV-Vis, EPR and electrochemistry measurements. These photoinduced aggregates can sensitize dissolved O2 to produce singlet oxygen, a surprising observation when it comes to sensitization efficiency for dyes as aggregation usually decreases sensitization yield. Laser-induced luminescence measurements corroborate the existence of monomeric and aggregate forms, as well as confirm triplet states as phosphorescence was detected, being particularly intense in concentrated THF solutions. Naphthalenediimide amphiphiles (NDI-as) with quaternary ammonium groups (DC4, DaP, and DaO) display unprecedented UV light-induced aggregation in solutions of water, acetonitrile and THF. (AU) | |
| Processo FAPESP: | 21/01509-0 - Géis nanoestruturados e sistemas supramoleculares multicomponentes |
| Beneficiário: | Eduardo Rezende Triboni |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/27157-3 - Estudo fotofísico e eletroquímico de géis baseados em semicondutores orgânicos |
| Beneficiário: | Thaisa Brandão Ferreira de Moraes |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 22/06346-5 - Sistemas multicomponentes desenhados em bisureias e diimidas |
| Beneficiário: | Eduardo Rezende Triboni |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |
| Processo FAPESP: | 22/02711-0 - Formação de complexos de NDI-Nióbio por métodos sonoros e mecânicos |
| Beneficiário: | Rafael Gagliardi Antoneli |
| Modalidade de apoio: | Bolsas no Brasil - Programa Capacitação - Treinamento Técnico |