The 2-pyridone/2-hydroxypyridine tautomerism in gas phase: An excited state roaming reaction
Marta Queizán,
Sara Gil-Guerrero,
Álvaro Pérez-Barcia
et al.
Abstract:Multiconfigurational methods (CASSCF and CASPT2) were employed to gain a new understanding of the mechanism of the gas-phase phototautomerization of 2-pyridone/2-hydroxypyridine. Potential energy curves and crossing points of the low-lying excited states were analyzed. The results show that the tautomerization only occurs from 2-pyridone to 2-hydroxypyridine after electronic excitation to the S1 (ππ*) state. From this state, the system would be able to reach a conical intersection between S1 and the dissociati… Show more
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