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Surface enhanced Raman spectroscopy (SERS) was used to investigate the structure of self-assembled monolayers of 2-mercaptopyridine (2Mpy) adsorbed on the surface of a roughened polycrystalline gold electrode from either water or 0.1 M aqueous H 2 SO 4 at different electrode potential values in 0.5 M aqueous H 2 SO 4 . A band in the range 215 to 245 cm −1 assigned to a gold-sulfur stretching mode indicates formation of a sulfur-bonded adsorbate of 2Mpy. There is also evidence that 2Mpy is bonded through the nitrogen atom of the pyridine ring forming a chelate-like structure. Results suggest a perpendicular orientation of 2Mpy on the gold surface.
Hassan et al. (2012) studied this question.