Abstract
The flavoprotein radicals exhibit so-called powder ESR spectra, which are mainly characterized by the anisotropic hyperfine tensors of the two strongly coupled nitrogens. Spectra simulations have been attempted. The powder electron-nuclear double resonance (ENDOR) spectra mainly consist of the signals due to the CH 2(8) group and the matrix protons. The degree of protonation of the radicals is inferable from the hyperfine coupling to this methyl group. The principal values for the hyperfine interaction with CH 3(8) could be studied by taking advantage of the anisotropy of the powder ESR spectrum. The results suggest a planar configuration of the neutral and anionic radicals within flavoproteins.
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