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Article citation: Tippu S. Sheriff, Dalton Trans., 2010, DOI: 10.1039/b915747f
Unexpected formation of a novel pyridinium-containing catecholate ligand and its manganese(III) complex
Tippu S. Sheriff, Michael Watkinson, Majid Motevalli and Jocelyne F. Lesin
Nucleophilic aromatic substitution of tetrachloro-o-benzoquinone by pyridine and reduction of the o-quinone to the catechol by hydroxylamine forms 1,2-dihydroxy-3,5,6-trichlorobenzene-4-pyridinium chloride. This compound reacts with manganese(II) acetate in air to form chlorobis(3,5,6-trichlorobenzene 4-pyridinium catecholate)manganese(III), which represents the first complex of this ligand class to be structurally characterized by X-ray diffraction; this complex is active in the catalytic reduction of dioxygen to hydrogen peroxide under ambient conditions and turnover frequencies (TOFs) >10
000 h-1 can be obtained.
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