Abstract
The electron spin resonance spectrum of the thioxanthone S,S-dioxide mononegative ion is investigated. Proton hyperfine splittings are reported. Moffitt's treatment of the expansion of the M-shell octet in sulfur is employed in the calculation of spin densities and the occurrence of sulfone conjugation in this radical is confirmed. Unpaired spin densities, calculated using one-electron MO theory with variation of Coulomb and resonance integral parameters, are not in close agreement with experiment. The McLachlan SCF theory with variation of parameters is applied. Negative spin densities are predicted at the 2,4 positions and good agreement with the hyperfine spectrum is obtained for reported ranges of the MO parameters.
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