The reaction between Fe(III) and dopamine in aqueous solution in the presence of Na 2 S 2 O 3 was followed through UV-Vis spectroscopy, pH and oxyreduction potential (Eh) measurements. The formation and quick disappearing of the complex [Fe(III)HL 1-] 2? , HL 1-= monoprotonated dopamine was observed with or without S 2 O 3 2-at pH 3. An unexpected reaction occurs in presence of thiosulfate forming the stable anion complex [Fe(III)(L 2-) 2 ] 1-, L 2-= dopacatecholate (k = 580 nm) and the auto-increasing of the pH, from 3 to 7. It was proposed that H ? and molecular oxygen are consumed by free radical thiosulfate formed during the reaction.
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