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1 H, 2 H, 19 F, 14 N ENDOR and TRIPLE resonance investigations of substituted flavin radicals in their different protonation states
Author(s) -
Weilbacher E.,
Helle N.,
Elsner M.,
Kurreck H.,
Müller F.,
Allendoerfer R. D.
Publication year - 1988
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260260115
Subject(s) - chemistry , radical , hyperfine structure , protonation , resonance (particle physics) , flavin group , electron paramagnetic resonance , hyperfine coupling , ion , coupling constant , crystallography , photochemistry , nuclear magnetic resonance , atomic physics , organic chemistry , physics , particle physics , enzyme
A variety of isotopically labelled and/or substituted flavins have been converted into their corresponding radical states. Cation and neutral radicals were generated chemically and anion radicals were obtained electrochemically. By performing ENDOR and TRIPLE resonance experiments, complete sets of hyperfine coupling constants including their signs were accessible. The hyperfine data allowed (a) identification of the radical state present, (b) information to be obtained about the preferred conformational arrangements of the substituents and (c) conclusions to be drawn about the influences of the substituents on the spin density distributions of the different radical states.