Femtosecond dynamics of excited-state intramolecular proton transfer in o-tosylaminobenzaldehyde
Photochemistry
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Abstract
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.
Keywords
Proton Transfer Probe Pulse High Energy Chemistry Excited State Absorption Excite State Intramolecular Proton Transfer
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