We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Non-classical disproportionation revealed by photo-chemically induced dynamic nuclear polarization NMR.
- Authors
Wörner, Jakob; Jing Chen; Bacher, Adelbert; Weber, Stefan
- Abstract
Photo-chemically induced dynamic nuclear polarization (photo-CIDNP) was used to observe the light-induced disproportionation reaction of 6,7,8-trimethyllumazine starting out from its triplet state to generate a pair of radicals comprising a one-electron reduced and a one-electron oxidized species. Our evidence is based on the measurement of two marker proton hyperfine couplings, Aiso(H(6α)) and Aiso(H(8α)), which we correlated to predictions from density functional theory. The ratio of these two hyperfine couplings is reversed in the oxidized and the reduced radical species. Observation of the dismutation reaction is facilitated by the exceptional C-H acidity of the methyl group at position 7 of 6,7,8-trimethyllumazine and the slow proton exchange associated with it, which leads to NMR-distinguishable anionic (TML-) and neutral (TMLH) protonation forms.
- Subjects
DENSITY functional theory; NUCLEAR magnetic resonance spectroscopy; POLARIZATION (Nuclear physics); DISPROPORTIONATION (Chemistry); HYPERFINE coupling; PROTON transfer reactions
- Publication
Magnetic Resonance, 2021, Vol 2, Issue 1, p281
- ISSN
2699-0016
- Publication type
Article
- DOI
10.5194/mr-2-281-2021