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

Andrew J. Wain, Gregory G. Wildgoose, Charles G. R. Heald, Li Jiang, Timothy G. J. Jones, Richard G. Compton

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70 Citations (Scopus)

Abstract

The influence of Li ion pairing on the voltammetric redn. of anthraquinone in MeCN is reported. On Au electrodes, the single electron redn. generates a radical anion which forms a complex with Li cations from the electrolyte. In situ ESR studies support this finding, and signal intensity measurements are used to est. a value for the complexation equil. const. Values calcd. were of the of the order of 6000 mol-1 dm3. Potential shift measurements and Digisim modeling are in support of a complexation mechanism in which a little of the complex ppts. on the electrode surface. The effect of Li ion pairing is also demonstrated for the case in which 1-anthraquinonyl groups are covalently attached to multiwalled C nanotubes abrasively immobilized on a basal plane pyrolytic graphite electrode. [on SciFinder(R)]
Original languageEnglish
Pages (from-to)3971-3978
Number of pages8
JournalThe Journal of Physical Chemistry B
Volume109
Issue number9
DOIs
Publication statusPublished - 2005

Keywords

  • covalently bound anthraquinone radical multiwalled carbon nanotube lithium pairing
  • ESR voltammetry lithium ion pairing electrogenerated anthraquinone radical anion

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