Electron paramagnetic resonance, ENDOR and TRIPLE resonance of some 9,10-anthraquinone radicals in solution. Part 3.—Hydroxyanthraquinones

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Abstract
EPR, ENDOR and TRIPLE resonance spectra have been recorded for 1,4-dihydroxy-9,10-anthraquinone, 1,5-dihydroxy-9,10-anthraquinone, 1,8-dihydroxy-9,10-anthraquinone, 2,6-dihydroxy-9,10-anthraquinone, 1,2-dihydroxy-9,10-anthraquinone, 1,2-dihydroxy-9,10-anthraquinone-3-sodium sulphonate and 1,2,5,8-tetrahydroxy-9,10-anthraquinone anion radicals. The hyperfine coupling constants and g factors are given. Use of a modified additivity relationship allowed assignment of the constants. The spectra of deuterated radicals are discussed.