title: Electrochemical ESR and voltammetric studies of lithium ion pairing with electrogenerated 9,10-anthraquinone radical anions either free in acetonitrile solution or covalently bound to multiwalled carbon nanotubes.
abstract: The influence of lithium ion pairing on the voltammetric reduction of anthraquinone in acetonitrile is reported. On gold electrodes, the single electron reduction generates a radical anion which forms a complex with lithium cations from the electrolyte. In situ ESR studies support this finding, and signal intensity measurements are used to estimate a value for the complexation equilibrium constant. Values calculated were of the of the order of 6000 mol(-1) dm3. Potential shift measurements and Digisim modeling are shown to be in support of a complexation mechanism in which a little of the complex precipitates on the electrode surface. The effect of lithium ion pairing is also demonstrated for the case in which 1-anthraquinonyl groups are covalently attached to multiwalled carbon nanotubes abrasively immobilized on a basal plane pyrolytic graphite electrode.
authors.affiliation: Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ United Kingdom.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Wain
authors.forename: Gregory G
authors.initials: GG
authors.lastname: Wildgoose
authors.forename: Charles G R
authors.initials: CG
authors.lastname: Heald
authors.forename: Li
authors.initials: L
authors.lastname: Jiang
authors.forename: Timothy G J
authors.initials: TG
authors.lastname: Jones
authors.forename: Richard G
authors.initials: RG
authors.lastname: Compton