Adsorption of 2-mercaptobenzimidazole on a Au(1 1 1) electrode

The description of the monolayer formed at Au(1 1 1) by 2-mercaptobenzimidazole (MBI) under potential control has been based on electrochemical data (charge measurements) and spectroscopic information from the subtractively normalized interfacial Fourier transform infrared spectroscopy method (SNIFT...

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Bibliographic Details
Published in:Electrochimica acta 2005-08, Vol.50 (21), p.4275-4282
Main Authors: Doneux, T., Buess-Herman, C., Hosseini, M.G., Nichols, R.J., Lipkowski, J.
Format: Article
Language:English
Subjects:
2-Mercaptobenzimidazole
Adsorption
Au electrode
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
SNIFTIRS
Study of interfaces
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Summary:The description of the monolayer formed at Au(1 1 1) by 2-mercaptobenzimidazole (MBI) under potential control has been based on electrochemical data (charge measurements) and spectroscopic information from the subtractively normalized interfacial Fourier transform infrared spectroscopy method (SNIFTIRS). From the quantitative analysis of the SNIFTIR spectra, a surface coverage Γ/ Γ max was extracted for each sample potential. The evolution of the coverage with potential was in full agreement with the charge density curve. The shift of the pzc in the presence of MBI indicates that the adsorbed molecules have a nonzero component of the permanent dipole moment in the direction perpendicular to the electrode surface. Thanks to the high quality of the spectra, it was possible to determine the orientation of MBI molecules at the surface in the monolayer and submonolayer range. The angle between the C 2-axis of the molecule and the direction normal to the surface is close to 64 ± 4° and its small change (
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2005.01.063