Photochemical analysis demonstrates ultrafast proton transfer across organic solvents, revealing sub-picosecond bond breaking and nanosecond geminate recombination.
We have used knowledge of the electronic structure of excited states of acids to design molecules that exhibit enhanced excited-state acidity. Such "super" photoacids are the strongest reversible photoacids known and allow the time evolution of proton transfer to be examined in a wide array of organic solvents. This includes breaking/formation of the hydrogen bonds in hundreds of femtoseconds, solvent reorientation and relaxation in picoseconds, proton dissociation, and, finally, diffusion and geminate recombination of the dissociated proton, observed in nanoseconds.
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Tolbert et al. (2001) studied this question.
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