Pulse Q-band EPR and ENDOR spectroscopies of the photochemically generated monoprotonated benzosemiquinone radical in frozen alcoholic solution.

@article{Flores2012PulseQE,
  title={Pulse Q-band EPR and ENDOR spectroscopies of the photochemically generated monoprotonated benzosemiquinone radical in frozen alcoholic solution.},
  author={Marco Flores and Melvin Y Okamura and Jens Niklas and Maria-Eirini Pandelia and Wolfgang Lubitz},
  journal={The journal of physical chemistry. B},
  year={2012},
  volume={116 30},
  pages={8890-900}
}
Quinones are essential cofactors in many physiological processes, among them proton-coupled electron transfer (PCET) in photosynthesis and respiration. A key intermediate in PCET is the monoprotonated semiquinone radical. In this work we produced the monoprotonated benzosemiquinone (BQH(•)) by UV illumination of BQ dissolved in 2-propanol at cryogenic temperatures and investigated the electronic and geometric structures of BQH(•) in the solid state (80 K) using EPR and ENDOR techniques at 34… CONTINUE READING