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The dynamics of excited-state intramolecular proton transfer (ESIPT) and of relaxation processes in o-tosylaminobenzoic acid (TAC) and o-acetylaminobenzoic acid (AAC) have been studied by femtosecond absorption spectroscopy with a time resolution of 30 fs. The ESIPT characteristic time in the TAC dimer and monomer and in AAC monomer is 50 fs. The excited product of photoinduced proton transfer in...
In the ground state, o-tosylaminobenzoic and o-acetylaminobenzoic acids exist in the form of two rotamers with intramolecular hydrogen bonds N-H...O=C (cis) and N-H...O(OH)-C (trans). In nonpolar solvents, the formation of dimers with hydrogen bonding between carboxyl groups takes place. Efficient barrierless excited state intramolecular proton transfer (ESIPT) occurs along the N-H...O=C hydrogen...
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