Electrochemical reduction of AQ27DS in aqueous solution

César A. C. Sequeira, R. F. Lobo, G. Anastassakis

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

It is known that anthraquinone derivatives act as aqueous sulphide oxidation catalysts, so the redox chemistry of the compound anthraquinone 2,7-disulphonate (AQ27DS) stimulated our interest, as reported here. AQ27DS was reduced in aqueous solution at pH 9.0 to give a deep red coloured air-sensitive solution. Cyclic voltammetry and exhaustive electrolysis indicated that the anthraquinone was reversibly reduced in a two electron, one proton process at a variety of electrode surfaces. From limiting current results at a rotating disc electrode, the diffusion coefficient of AQ27DS was calculated to be 3.37 × 10-10 m2 5-1. Spectroscopic results confirmed that AQ27DSH- was the major reduced species, but also indicated that the di-anion (AQ27DS2-) and radical species AQ27DS were also present. ESR spectroscopy showed that the radical was formed via a comproportionation reaction between the di-anion and the AQ27DS starting material. The peak separation from voltammetry enabled the comproportionation constant (K c) to be estimated, and it was found to be in the range of 0.4 to 4.

Original languageEnglish
Title of host publicationFast Software Encryption - 14th International Workshop, FSE 2007, Revised Selected Papers
EditorsP. M. Vilarinho
PublisherTrans Tech Publications Ltd
Pages1338-1342
Number of pages5
VolumePART 2
ISBN (Print)9780878494026
DOIs
Publication statusPublished - 1 Dec 2006
Event3rd International Materials Symposium and 12th Portuguese Materials Society Meeting 2005 - Aveiro, Portugal
Duration: 20 Mar 200523 Mar 2005

Publication series

NameMaterials Science Forum
PublisherTrans Tech Publications Ltd
NumberPart 1-2
Volume514-516
ISSN (Print)0255-5476

Conference

Conference3rd International Materials Symposium and 12th Portuguese Materials Society Meeting 2005
CountryPortugal
CityAveiro
Period20/03/0523/03/05

Keywords

  • Anthraquinone-disulphonate
  • Cyclic voltammetry
  • Electrochemical reduction
  • Exhaustive electrolysis
  • Rotating disc electrode
  • Spectroscopy

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