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Transition from vehicle to Grotthuss proton transfer in a nanosized flask: Cryogenic ion spectroscopy of protonated p-aminobenzoic acid solvated with D2O Proton transfer (PT) is one of the most ubiquitous reactions in chemistry and life science. The unique nature of PT has been rationalized not by a transport of a solvated proton (vehicle mechanism) but by the Grotthuss mechanism in which a proton is transported to the nearest proton acceptor along a hydrogen-bonded network.
Hydration-induced protomer switching in p-aminobenzoic acid studied by cold double ion trap infrared spectroscopy† Kyota Akasaka,ab Keisuke Hirata, acd Fuad Haddad,e Otto Dopfer, *de Shun-ichi Ishiuchi *acd and Masaaki Fujii *abd Abstract Para-Aminobenzoic acid (PABA) is a benchmark molecule to study solvent-induced proton site switching. Protonation of the carboxy and amino groups of PABA generates O- and N-protomers of PABAH+, respectively.
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