Femtosecond dynamics of excited-state intramolecular proton transfer in o-tosylaminobenzaldehyde
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- Khimich, M.N., Nadtochenko, V.A., Popov, L.D. et al. High Energy Chem (2012) 46: 247. doi:10.1134/S001814391204008X
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Dynamics of excited-state intramolecular proton transfer (ESIPT) in o-tosylaminobenzaldehyde has been studied by femtosecond absorption spectroscopy with a time resolution of 30 fs. The characteristic time of this process is ∼100 fs. Differential absorption rate curves exhibit oscillations that are consistent with theoretically predicted ESIPT-promoting vibrational modes. Efficient nonradiative deactivation with a rate constant of 6.25 × 1010 s−1 occurs in the excited product of proton transfer, with internal rotation followed by intersystem crossing being one of the feasible deactivation pathways.