Abstract
Selectivelyl3C-labeled ubiquinone anion radicals in protic and aprotic solvents are investigated by EPR and ENDOR spectroscopy, yielding information about the effect of hydrogen bonds on the electronicg-tensor and the carbonyl carbon13C-hf tensors. Formation of the hydrogen bonds alter theg-tensor significantly to lower values and increases theA zz , component of thel3C-hf tensor. Both effects can be explained by electrostatic interactions between the positively charged hydrogen and the electrons at the carbonyl oxygen leading to a redistribution of charge and π-spin density. Two different hydrogen bonds were obtained for UQ −0 which are in agreement with the results of DFT (density functional theory) calculations.
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Nimz, O., Lendzian, F., Boullais, C. et al. Influence of hydrogen bonds on the electronicg-tensor and13C-hyperfine tensors of13C-labeled ubiquinones — EPR and ENDOR study. Appl. Magn. Reson. 14, 255–274 (1998). https://doi.org/10.1007/BF03161893
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DOI: https://doi.org/10.1007/BF03161893