Electrochemical reduction of AQ27DS in aqueous solution

Sequeira, CAC; Lobo, RF; Anastassakis, G

dc.contributor.author	Sequeira, CAC	en
dc.contributor.author	Lobo, RF	en
dc.contributor.author	Anastassakis, G	en
dc.date.accessioned	2014-03-01T02:44:02Z
dc.date.available	2014-03-01T02:44:02Z
dc.date.issued	2006	en
dc.identifier.issn	0255-5476	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/31628
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-38049078854&partnerID=40&md5=907caf15343418179e0482bb43c62627	en
dc.subject	Anthraquinone-disulphonate	en
dc.subject	Cyclic voltammetry	en
dc.subject	Electrochemical reduction	en
dc.subject	Exhaustive electrolysis	en
dc.subject	Rotating disc electrode	en
dc.subject	Spectroscopy	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Electrochemical reduction	en
dc.subject.other	Exhaustive electrolysis	en
dc.subject.other	Rotating disc electrodes	en
dc.subject.other	Cyclic voltammetry	en
dc.subject.other	Diffusion	en
dc.subject.other	Electrochemistry	en
dc.subject.other	Electrodes	en
dc.subject.other	Electrolysis	en
dc.subject.other	Reduction	en
dc.subject.other	Inorganic compounds	en
dc.title	Electrochemical reduction of AQ27DS in aqueous solution	en
heal.type	conferenceItem	en
heal.language	English	en
heal.publicationDate	2006	en
heal.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 x 10(-10) m(2) s(-1). Spectroscopic results confirmed that AQ27DSH(-) was the major reduced species, but also indicated that the di-anion (AQ27DS(2-)) 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.	en
heal.publisher	TRANS TECH PUBLICATIONS LTD	en
heal.journalName	Materials Science Forum	en
heal.bookName	MATERIALS SCIENCE FORUM	en
dc.identifier.isi	ISI:000238056400266	en
dc.identifier.volume	514-516	en
dc.identifier.issue	PART 2	en
dc.identifier.spage	1338	en
dc.identifier.epage	1342	en