Photohydration of benzophenone in aqueous acid

@inproceedings{Ramseier2003PhotohydrationOB,
  title={Photohydration of benzophenone in aqueous acid},
  author={Markus Ramseier and Paul Senn and Jakob Wirz},
  year={2003}
}
Why is the triplet state of aromatic ketones quenched by protons? The long-known but unexplained quenching process was investigated in detail for benzophenone (1). Adiabatic protonation of triplet benzophenone, 31, encounters a state symmetry-imposed barrier, because the electronic structure of 31 is n,π*, while that of its conjugate acid, 31H+, is π,π*. Hence, the rate of protonation of 31, kH+ = 6.8 × 108 M-1 s-1, is well below the diffusion-controlled limit. The short-lived transient… CONTINUE READING

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