Excited-State Proton Transfer: From Constrained Systems to “Super” Photoacids to Superfast Proton Transfer
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- 27 November 2001
- journal article
- research article
- Published by American Chemical Society (ACS) in Accounts of Chemical Research
- Vol. 35 (1) , 19-27
- https://doi.org/10.1021/ar990109f
Abstract
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.Keywords
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