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- W3011082968 abstract "Ultrafast non-adiabatic dynamics of the small heteroaromatic compound 2-thiopyridone has been studied with surface hopping simulations based on multi-configurational quantum chemistry. Initial excitation of the bright S2(π,π*) state is found to promptly relax to S1(n, π* ) through in-plane motion. The subsequent dynamics are oppositely driven by out-of-plane motion, which results in both complex population transfers among all the available states and intersystem crossing predominantly through the El-Sayed forbidden S1(n, π* ) to T2(n, π* ) channel, through significant mixing of electronic excitation characters. Despite this complexity, the femto- to picosecond triplet population, expected from several spectroscopic measurements, is well described as a simple exponential decay of the singlet state manifold. No proton transfer is found in the reported trajectories, but two mechanisms for its possible mediation in previously reported experiments are proposed based on the observed structural dynamics: (i) ultrafast intra-molecular transfer driven by the initially coherent in-plane motion and (ii) inter-molecular solvent-mediated transfer driven by the out-of-plane modes that dominate the later motion." @default.
- W3011082968 created "2020-03-23" @default.
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- W3011082968 date "2020-03-01" @default.
- W3011082968 modified "2023-10-14" @default.
- W3011082968 title "Ultrafast dynamics of photo-excited 2-thiopyridone: Theoretical insights into triplet state population and proton transfer pathways" @default.
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- W3011082968 doi "https://doi.org/10.1063/1.5143228" @default.
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