Time-Resolved Resonance Raman and Surface-Enhanced Resonance Raman Scattering Study on Monocation Radical Formation Processes of Heptyl Viologen at Silver Electrode Surfaces

  • Y. Mineo
  • K. Shibasaki
  • N. Yamasawa
  • K. Itoh
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 68)

Abstract

Heptyl viologen (HV2+ (X)2, X= a counter anion; see Figure 1) has been known to perform a one-electron redox reaction with half-wave potential near -0.4 V (vs. Ag/AgCl). Monocation radical (HV X), which is formed on stepping electrode potential to a value negative of -0.4 V, is insoluble in water and forms a red-purple film giving a broad band centered around 550 nm on an electrode. On reversing the potential to a value positive of -0.4 V, the colored film disappears. This property can be applied to electrochromic display devices. Therefore, a number of studies have been made to elucidate the mechanism of the film formation process. [1, 2] These studies have proved that the initial film formation consists of nucleation, nuclear growth and subsequent film formation processes. In the present paper we applied time-resolved resonance Raman scattering (RRS) and surface-enhanced resonance Raman scattering (SERRS) spectroscopies to analyze these processes. Time-resolved RRS spectra have already been reported by Osawa and Suetaka [3] for HV films on a Pt electrode; the spectra, however, were observed with time resolution of 5 msec and recorded after the initial processes had already terminated. So, we confined the measurement mainly within several milliseconds since the application of reduction potential.

Keywords

Benzyl Heptyl 

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References

  1. [1]
    J. Bruinink and C.G.A. Kregting, J. Electrochem. Soc. 125, 1397 (1978).CrossRefGoogle Scholar
  2. [2]
    R. Cieslinski and N.R. Armstrong, J. Electroanal. Chem. 161, 59 (1984).CrossRefGoogle Scholar
  3. [3]
    M. Osawa and W. Suetaka, J. Electroanal. Chem. 270, 261 (1989).CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • Y. Mineo
    • 1
  • K. Shibasaki
    • 1
  • N. Yamasawa
    • 1
  • K. Itoh
    • 1
  1. 1.Department of Chemistry, School of Science and EngineeringWaseda UniversityShinjuku-ku, Tokyo 169Japan

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