Excited-state intermolecular proton transfer reactions of 7-azaindole(MeOH) n (n = 1-3) clusters in the gas phase: On-the-fly dynamics simulation

Rathawat Daengngern, Nawee Kungwan, Peter Wolschann, Adélia J.A. Aquino, Hans Lischka, Mario Barbatti

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33 Scopus citations

Abstract

Ultrafast excited-state intermolecular proton transfer (PT) reactions in 7-azaindole(methanol) n (n = 1-3) [7AI(MeOH) n=1-3] complexes were performed using dynamics simulations. These complexes were first optimized at the RI-ADC(2)/SVP-SV(P) level in the gas phase. The ground-state structures with the lowest energy were also investigated and presented. On-the-fly dynamics simulations for the first-excited state were employed to investigate reaction mechanisms and time evolution of PT processes. The PT characteristics of the reactions were confirmed by the nonexistence of crossings between S ππ* and S πσ* states. Excited-state dynamics results for all complexes exhibit excited-state multiple-proton transfer (ESmultiPT) reactions via methanol molecules along an intermolecular hydrogen-bonded network. In particular, the two methanol molecules of a 7AI(MeOH) 2 cluster assist the excited-state triple-proton transfer (ESTPT) reaction effectively with highest probability of PT.

Original languageEnglish
Pages (from-to)14129-14136
Number of pages8
JournalJournal of Physical Chemistry A
Volume115
Issue number49
DOIs
StatePublished - Dec 15 2011

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