Competition between fluorescence and triplet production ruled by nitro groups in one-arm and two-arm styrylbenzene heteroanalogues (CROSBI ID 285179)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Mencaroni, Letizia ; Carlotti, Benedetta ; Cesaretti, Alessio ; Elisei, Fausto ; Grgičević, Ana ; Škorić, Irena ; Spalletti, Anna
engleski
Competition between fluorescence and triplet production ruled by nitro groups in one-arm and two-arm styrylbenzene heteroanalogues
The competition between excited state deactivation processes in mono and double-arm push-pull systems bearing pyridine, furan or thiophene (electron donors) and nitro groups (electron acceptors) was investigated in several solvents through nanosecond and femtosecond transient absorption spectroscopy. Triplet population is the main deactivation pathway for the mono- arm compounds. The large triplet production is mainly ascribed to 3 (n, π*) states almost isoenergetic to S1, introduced by nitro groups, as predicted by TD-DFT calculations. The large triplet population may indeed be exploited to produce long-lived excitons for photovoltaic and optoelectronic applications. Two-arm furan and thiophene derivatives instead undergo strong ultrafast intramolecular charge transfer (ICT), which is responsible for their appreciable two- photon absorption cross-sections. In this case, significant fluorescence and singlet oxygen quantum yields are obtained, making these two compounds interesting as potential traceable photosensitizers in photodynamic therapy.
fluorescence ; furan ; heterostilbene ; photophysical characterization ; pyridine ; thiophene ; triplet production
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o izdanju
19 (12)
2020.
1665-1676
objavljeno
1474-905X
1474-9092
10.1039/D0PP00271B
Povezanost rada
Interdisciplinarne prirodne znanosti, Kemija