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Transition Metal Chemistry

, Volume 34, Issue 6, pp 677–681 | Cite as

A study of the aerobic reaction between dopamine and Fe(III) in the presence of S2O3 2−

  • Wagner José BarretoEmail author
  • Sonia Regina Giancoli Barreto
  • Waleria Pickina Silva
Article

Abstract

The reaction between Fe(III) and dopamine in aqueous solution in the presence of Na2S2O3 was followed through UV–Vis spectroscopy, pH and oxy-reduction potential (Eh) measurements. The formation and quick disappearing of the complex [Fe(III)HL1−]2+, HL1− = monoprotonated dopamine was observed with or without S2O3 2− at pH 3. An unexpected reaction occurs in presence of thiosulfate forming the stable anion complex [Fe(III)(L2−)2]1−, L2− = dopacatecholate (λ = 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.

Keywords

Dopamine Thiosulfate Aerobic Reaction Na2S2O3 Dioxolene 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors thank the CNPq, Fundação Araucária and FAEPE/UEL for the financial support. Waleria P. Silva is thankful to CNPq for the scholarship.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Wagner José Barreto
    • 1
    Email author
  • Sonia Regina Giancoli Barreto
    • 1
  • Waleria Pickina Silva
    • 1
  1. 1.Laboratory of Environmental Physical Chemistry, CCE, Department of ChemistryLondrina State UniversityLondrinaBrazil

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