Artículos de revistas
Trapped hydronium radical produced by ultraviolet excitation of substituted aromatic molecule
Fecha
2015-12-04Registro en:
Hernández, Federico Javier; Capello, Marcela Carolina; Naito, Ayumi; Manita, Shun; Tsukada, Kohei; et al.; Trapped hydronium radical produced by ultraviolet excitation of substituted aromatic molecule; American Chemical Society; Journal of Physical Chemistry A; 119; 51; 4-12-2015; 12730-12735
1089-5639
1520-5215
CONICET Digital
CONICET
Autor
Hernández, Federico Javier
Capello, Marcela Carolina
Naito, Ayumi
Manita, Shun
Tsukada, Kohei
Miyazaki, Mitsuhiko
Fujii, Masaaki
Broquier, Michel
Gregoire, Gabriel Eduardo
Dedonder Lardeux, Claude
Jouvet, Christophe
Pino, Gustavo Ariel
Resumen
The gas phase structure and excited state dynamics of o-aminophenol-H2O complex have been investigated using REMPI, IR-UV hole-burning spectroscopy, and pump–probe experiments with picoseconds laser pulses. The IR-UV spectroscopy indicates that the isomer responsible for the excitation spectrum corresponds to an orientation of the OH bond away from the NH2 group. The water molecule acts as H-bond acceptor of the OH group of the chromophore. The complexation of o-aminophenol with one water molecule induced an enhancement in the excited state lifetime on the band origin. The variation of the excited state lifetime of the complex with the excess energy from 1.4 ± 0.1 ns for the 0–0 band to 0.24 ± 0.3 ns for the band at 0–0 + 120 cm–1 is very similar to the variation observed in the phenol-NH3 system. This experimental result suggests that the excited state hydrogen transfer reaction is the dominant channel for the non radiative pathway. Indeed, excited state ab initio calculations demonstrate that H transfer leading to the formation of the H3O• radical within the complex is the main reactive pathway.