Calmagite dye oxidation using in situ generated hydrogen peroxide catalysed by manganese(II) ions.

Tippu S Sheriff, Steven Cope, Mmaezi Ekwegh

Index: Dalton Trans. (44) , 5119-22, (2007)

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Abstract

Hydrogen peroxide (H(2)O(2)) generated from the manganese(II) catalysed reduction of dioxygen has been shown to efficiently oxidize Calmagite (3-hydroxy-4-(2-hydroxy-5-methylphenylazo)naphthalene-1-sulfonic acid) in aqueous solution at pH 8.0 and 20 +/- 1 degrees C with de-protonated Tiron (1,2-dihydroxybenzene-3,5-disulfonate, disodium salt) acting as an essential co-ligand.