Issue 4, 2001
From the journal:

Journal of the Chemical Society, Perkin Transactions 2

The oxidation of 6-hydroxydopamine in aqueous solution. Part 2.19 Speciation and product distribution with iron(III) as oxidant †

Guy N. L. Jameson ‡*a  and  Wolfgang Linerta  

* Corresponding authors

a Institute of Inorganic Chemistry, Technical University of Vienna, Getreidemarkt 9/153, Vienna, Austria
E-mail: gjameson@physics.emory.edu; , wlinert@mail.zserv.tuwien.ac.at

Abstract

6-Hydroxydopamine [5-(2-aminoethyl)benzene-1,2,4-triol, protonated form H3LH+] reacts anaerobically with aqueous iron(III) to produce four types of quinone, namely the p- ( pQ), o- (oQ), triketo- (tQ) and the deprotonated quinone (Q−). The relative concentrations depend strongly on the pH. At low pH pQ, oQ and tQ predominate and are in meta-stable equilibrium. However, the pH dependency of the concentrations of pQ and tQ at low pH suggests an equilibrium between their respective semiquinones. Above a pH of about 2, tQ disappears and above about 2.5 pQ and oQ equilibrate via Q−, which, above a pH of about 6, is the only species present. The equilibrium constants and molar absorbances have been measured for all these species and are discussed. The speciation over the pH range 0.5–5 has been determined as a necessary prelude to a full kinetic study of the system.

Graphical abstract: The oxidation of 6-hydroxydopamine in aqueous solution. Part 2.19 Speciation and product distribution with iron(III) as oxidant [ ]

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Article information

DOI
https://doi.org/10.1039/B007162P
Article type
Paper
Submitted
05 Sep 2000
Accepted
15 Feb 2001
First published
20 Mar 2001

J. Chem. Soc., Perkin Trans. 2, 2001, 563-568

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The oxidation of 6-hydroxydopamine in aqueous solution. Part 2. Speciation and product distribution with iron(III) as oxidant

G. N. L. Jameson<img border="0" src="https://www.rsc.org/images/entities/char_200a.gif" alt=" " xmlns="http://www.rsc.org/schema/rscart38" /> and W. Linert, J. Chem. Soc., Perkin Trans. 2, 2001, 563 DOI: 10.1039/B007162P

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