Polarization modulation IR spectroscopic study of electrochemically generated species from TCNE at a gold electrode in the Kretschmann ATR geometry

T. Wadayama, Y. Momota, A. Hatta, W. Suëtaka

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8 Citations (Scopus)

Abstract

Polarization modulation infrared spectroscopy using the Kretschmann ATR geometry has been applied to the in-situ observation of tetracyanoethylene (TCNE) anions generated electrochemically on a gold electrode in contact with an acetonitrile solution. Besides the electrode potential-independent band at 2252 cm-1 due to the CN stretching vibration of acetonitrile, a fairly strong band was observed at ca. 2170 cm-1 at a potential of -1.6 V (vs. a Ag/10-2 M Ag+ electrode). Upon a positive shift of potential, this band shifted to higher wavenumbers and decreased in intensity. At -1.2 V, a new band appeared at around 2110 cm-1 and shifted to higher wavenumbers when the potential was made more positive. On the basis of the potential dependence and peak frequencies, the 2170 and 2110 cm-1 bands are attributed to the CN stretching vibrations of TCNE2- and TCNE.- adsorbed on the Au electrode, respectively. The orientations of these species with respect to the surface are discussed on the basis of the surface selection rule.

Original languageEnglish
Pages (from-to)29-36
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume289
Issue number1-2
DOIs
Publication statusPublished - 1990 Aug 24

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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