Excited state hydrogen transfer dynamics in phenol–(NH3)2 studied by picosecond UV-near IR-UV time-resolved spectroscopy

2020 ◽  
Vol 22 (10) ◽  
pp. 5740-5748
Author(s):  
Shun-ichi Ishiuchi ◽  
Junko Kamizori ◽  
Norihiro Tsuji ◽  
Makoto Sakai ◽  
Mitsuhiko Miyazaki ◽  
...  
Keyword(s):  
Excited State ◽  
Hydrogen Transfer ◽  
Transfer Reaction ◽  
Bound State ◽  
Intersystem Crossing ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Hydrogen Transfer Reaction ◽  
Near Ir

Intersystem crossing from 1πσ* to 3πσ* states traps excited state hydrogen transfer reaction in a bound state formed by 3ππ* and 3πσ* states.

Excited States of C70and the Intersystem Crossing Process Studied by Picosecond Time-Resolved Spectroscopy in the Visible and Near-IR Region

1996 ◽  
Vol 100 (25) ◽  
pp. 10518-10522 ◽  
Author(s):  
Akira Watanabe ◽  
Osamu Ito ◽  
Motoyuki Watanabe ◽  
Haruhisa Saito ◽  
Musubu Koishi
Keyword(s):  
Excited States ◽  
Intersystem Crossing ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Near Ir

scholarly journals Photoinduced Intramolecular Hydrogen Transfer Reaction of Ortho Nitrobenzyl Compounds

1999 ◽  
Vol 19 (1-4) ◽  
pp. 357-362 ◽  
Author(s):  
Hiroaki Takahashi ◽  
Yoshiki Watanabe ◽  
Makoto Sakai ◽  
Masanori Tachikawa
Keyword(s):  
Nitro Group ◽  
Absorption Spectra ◽  
Hydrogen Transfer ◽  
Transfer Reaction ◽  
Resonance Raman ◽  
Polar Solvents ◽  
Time Resolved ◽  
Hydrogen Transfer Reaction ◽  
Intramolecular Hydrogen

Time-resolved resonance Raman and absorption spectra have revealed that the photoinduced intramolecular hydrogen transfer reaction of ortho nitrobenzyl compounds is initiated by the abstraction of methylene hydrogen by the ortho nitro group to generate the ortho aci-nitro acid isomer. In polar solvents the ortho aci-nitro acid is dissociated into the aci-nitro anion and a proton, and the proton is captured by other hydrogen accepting sites, such as 2-pyridyl, 4-pyridyl and 4-nitro groups to generate the ortho N—H quinoid, para N—H quinoid and para aci-nitro acid isomers, respectively. For 2-nitroethylbenzene and 2- and 4-(2′-nitrobenzyl)pyridines the structure of the aci-nitro anion is very similar to that of their respective ortho aci-nitro acid, while for 2,4-dinitroethylbenzene the structure of the aci-nitro anion quite resembles that of the para aci-nitro acid.

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