Excited-state proton transfer (ESPT) plays a vital role in many systems that are very important to any description of molecular interactions, not only in the field of photochemistry but also in photobiological phenomena. Inter- and intramolecular ESPT, as well as energy and electron transfer, also provide us with fundamental concepts in the design of the photochromic systems found in functional polymers and other molecular assemblies. In 1952, Förster  initiated research in the field of intermolecular ESPT with his study of 2-naphthol. He demonstrated that pK a* is the hydroxyl group of 2-naphthol decreased significantly in the singlet excited state compared with the ground state. Further, Weller  found that methyl salicylate (MS) presented an unusually large Stokes shifted fluorescence due to intramolecular ESPT. Since their pioneering work on ESPT, numerous investigations have been carried out in both the liquid and the solid state.
KeywordsProton Transfer Transient Absorption Potential Energy Curve Methyl Salicylate Double Proton Transfer
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