Electrochemical properties of adsorbed alkanethiol monolayers on mercury electrode surfaces

Fumio Matsushita, Shuji Miyaoka, Tokuji Ikeda, Mitsugi Senda

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

n-Alkanethiols (CH3(CH2)nSH, n=3,5,11,13,15,17) have been adsorbed at mercury electrodes from ethanolic solutions. A. c. voltammetry has been carried out of the adsorbed alkanethiol on mercury electrodes in aqueous solutions containing 1 M KCl at 25°C. Cyclic d.c. voltammetry of several metal ions also has been performed at these electrodes. The results show that long-chain alkanethiols n ≥ 11 can form densely packed monolayers with fully extended alkyl chains in the potential range between 0 and -0. 7 volt vs. Ag/AgCl. Metal ions such as Pb2+ are unable to penetrate into the monolayer. In contrast, short-chain alkanethiols with n = 3 and 5 form less ordered and loosely packed adsorption layers, which are permeable to the metal ions. A pH dependent a.c. voltammetric peak is observed at a mercury electrode with adsorbed alkanethiol (n=5) in buffer solutions, which is attributable to the redox reaction of the adsorbed thiol: [CH3(CH2)5S]adHg + H+ + e- [CH3(CH2)SH]adHg.

Original languageEnglish
Pages (from-to)1685-1688
Number of pages4
JournalAnalytical Sciences
Volume7
DOIs
Publication statusPublished - 01-01-1991

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Mercury
Electrochemical properties
Monolayers
Metal ions
Electrodes
Redox reactions
Voltammetry
Sulfhydryl Compounds
Cyclic voltammetry
Buffers
Adsorption

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

Matsushita, Fumio ; Miyaoka, Shuji ; Ikeda, Tokuji ; Senda, Mitsugi. / Electrochemical properties of adsorbed alkanethiol monolayers on mercury electrode surfaces. In: Analytical Sciences. 1991 ; Vol. 7. pp. 1685-1688.
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Electrochemical properties of adsorbed alkanethiol monolayers on mercury electrode surfaces. / Matsushita, Fumio; Miyaoka, Shuji; Ikeda, Tokuji; Senda, Mitsugi.

In: Analytical Sciences, Vol. 7, 01.01.1991, p. 1685-1688.

Research output: Contribution to journalArticle

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AB - n-Alkanethiols (CH3(CH2)nSH, n=3,5,11,13,15,17) have been adsorbed at mercury electrodes from ethanolic solutions. A. c. voltammetry has been carried out of the adsorbed alkanethiol on mercury electrodes in aqueous solutions containing 1 M KCl at 25°C. Cyclic d.c. voltammetry of several metal ions also has been performed at these electrodes. The results show that long-chain alkanethiols n ≥ 11 can form densely packed monolayers with fully extended alkyl chains in the potential range between 0 and -0. 7 volt vs. Ag/AgCl. Metal ions such as Pb2+ are unable to penetrate into the monolayer. In contrast, short-chain alkanethiols with n = 3 and 5 form less ordered and loosely packed adsorption layers, which are permeable to the metal ions. A pH dependent a.c. voltammetric peak is observed at a mercury electrode with adsorbed alkanethiol (n=5) in buffer solutions, which is attributable to the redox reaction of the adsorbed thiol: [CH3(CH2)5S]adHg + H+ + e- [CH3(CH2)SH]adHg.

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