Abstract
Self-assembled monolayers of 4-mercaptopyridine adsorbed on polycrystalline gold electrodes were investigated with cyclic voltammetry and surface-enhanced Raman spectroscopy (SERS). Within the electrode potential window given by the onset of hydrogen and oxygen evolution results from both methods suggest a perpendicular adsorption geometry with a Au-S bond being the anchoring function. pH effects typical of unbuffered electrolyte solutions related to the adsorbate tautomerism are observed spectroelectrochemically.
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Notes
4-(2-mercaptoethyl)pyridinium is equal to 4-(mercaptoethyl)pyridinium); nevertheless, the nomenclature proposed by the latter authors is maintained.
Unfortunately, this report is marred by discrepancies and inconsistencies (e.g., varying and multiple assignments of bands).
This supporting electrolyte was used here because it was also employed in previous analytical studies [5].
The authors appreciated a suggestion by a reviewer addressing this possibility.
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Acknowledgments
Stimulating discussions with D. Mandler are appreciated. The financial support from the Fonds der Chemischen Industrie and the Deutsche Forschungsgemeinschaft (Gaduiertenkolleg GRK 829/1) is also gratefully acknowledged.
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This study is dedicated to Mikhail Vorotyntsev on the occasion of his 70th anniversary in recognition of his numerous contributions to electrochemistry and beyond.
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Bron, M., Holze, R. Structural studies of self-assembled monolayers of 4-mercaptopyridine on gold electrodes with surface-enhanced Raman spectroscopy. J Solid State Electrochem 19, 2673–2682 (2015). https://doi.org/10.1007/s10008-015-2869-9
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DOI: https://doi.org/10.1007/s10008-015-2869-9