Femtochemistry of Intramolecular Charge and Proton Transfer Reactions in Solution

We report on the first observation of ultrafast intramolecular charge‐ and proton‐transfer reactions in 4′‐dimethylaminoflavonol (DAMF) in solution. Upon femtosecond excitation of a non‐planar structure of DMAF in apolar medium, the intramolecular charge transfer (ICT) does not occur, and a slow (2 ps) proton motion takes place. However, in polar solvents, the ICT is very fast (100–200 fs) and the produced structure is stabilized that proton motion takes place in few or tens of ps.