Coverage dependent behavior of redox reaction induced structure change and mass transport at an 11-ferrocenyl-1-undecanethiol self-assembled monolayer on a gold electrode studied by an in situ IRRAS-EQCM combined system

Shen Ye, Toshio Haba, Yukari Sato, Katsuaki Shimazu, Kohei Uosaki

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72 Citations (Scopus)

Abstract

The potential dependent structure change and mass transport at an 11- ferrocenyl-1-undecanethiol (FcC(II)SH) self-assembled monolayer on a gold electrode with various coverages were investigated by simultaneous Fourier transform infrared reflection absorption spectroscopy (IRRAS) and electrochemical quartz crystal microbalance (EQCM) measurements in 0.1 M HClO4 solution. As soon as the terminal ferrocene group was oxidized to a ferricenium cation (Fc+), a number of upward and downward IRRAS bands were observed and the surface mass was increased. The intensity of the IRRAS bands corresponded well with the mass change. This behavior is attributed to the redox reaction induced orientation change in the FcC11SH monolayer and ion pair formation between the Fc+ cation and the perchlorate anion in solution. The FcC11SH monolayer with a lower coverage was less stable and was decomposed at a less positive potential than that with a high coverage. Models are proposed to explain the coverage dependent behavior of the FcC11SH monolayer induced by the redox reaction of the terminal ferrocene moiety.

Original languageEnglish
Pages (from-to)3653-3659
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume1
Issue number15
DOIs
Publication statusPublished - 1999 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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