ENDOR and EPR studies of highly isotopically 13C-enriched ubiquinone radicals
- 1 January 1994
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 3,p. 609-614
- https://doi.org/10.1039/p29940000609
Abstract
ENDOR and EPR measurements of anionic, neutral and diprotonated radical cations of 13C-1-labelled ubiquinone 0 in solution are presented. The 13C-carbonyl hyperfine coupling constant in protic solvents is roughly half of that in aprotic solvents. Preferred conformers of diprotonated ubiquinone and neutral radicals exist as a result of intramolecular H-bonding interactions. The variation of spin densities on the ubiquinone ring carbon atoms correlates with the calculated out-of-plane twist angles of the methoxy groups.Keywords
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