New five- and six-coordinate complexes containing the [Mn(III)(Br4cat)2](-) core (Br4cat(2-) = tetrabromo-1,2-catecholate) have been prepared. Homoleptic [Mn(III)(Br4cat)3](3-) reacts rapidly with O2 to produce tetrabromo-1,2-benzoquinone (Br4bq). The [Mn(III)(Br4cat)2](-) fragment is a robust catalytic platform for the aerobic conversion of catechols to quinones. The oxidase activity apparently derives from the coupling of metal- and ligand-centered redox events.
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Rolle et al. (2008) studied this question.
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