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Behavior of the semiquinone anion radical of hypocrellin B produced by electrolysis in dimethylsulfoxide

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The behavior of the semiquinone anion radical of hypocrellin B (HB), produced by electrolysis, has been studied by cyclic voltammetry, steady-state electron spin resonance, timeresolved electron spin resonance and in situ UV-Vis spectra. The results showed that the formation mechanisms of HB—· were different between electrolysis and photolysis, and the disproportionation of semiquinone anion radical of HB (HB—·) could not occur in dimethylsulfoxide; on the contrary, a syn-proportionation reaction in which HB2— reacts with HB to form HB—· was observed experimentally. At the same time, the kinetic parameters of HB—· were obtained from the time-decay experiments of HB—·.


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