Redox properties of ferrocenylalkane thiols coadsorbed with linear n-alkanethiols on polycrystalline bulk gold electrodes

Mixed monolayer films were prepared from ethanol solutions of ω-ferrocenylhexanethiol and simple C 4C 10 n-alkanethiols. The following trends are observed as the alkanethiol chain length increases: the amount of immobilized ferrocene decreases and the redox potential for ferrocene oxidation becomes...

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Bibliographic Details
Published in:Analytica chimica acta 1991-05, Vol.246 (1), p.233-239
Main Authors: Creager, Stephen E., Rowe, Gary K.
Format: Article
Language:English
Subjects:
Alkanethiols
Chemistry
Electrochemistry
Electrodeposition
Exact sciences and technology
Ferrocenylalkanethiols
General and physical chemistry
Gold electrode
Study of interfaces
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Summary:Mixed monolayer films were prepared from ethanol solutions of ω-ferrocenylhexanethiol and simple C 4C 10 n-alkanethiols. The following trends are observed as the alkanethiol chain length increases: the amount of immobilized ferrocene decreases and the redox potential for ferrocene oxidation becomes more positive. The redox potential ranges from +0.20 V vs. Ag/AgCl for the shorter homologues to +0.39 V for coadsorption with n-decanethiol. Further, the potential scales with log[ C HClO 4 , confirming that ion pairing occurs. A localized non-polar environment created by the coadsorbed alkanethiols is postulated.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(00)80680-7