Abstract
The stability of the SAM formed by 4-mercaptopyridine (pyS) coordinated to the [Ru(CN)5]3− moiety (RupyS) has been evaluated by SERS and LSV as function of the electrode immersion time in the modifier solution. The cathodic shift observed for the potential assigned to the RS–Au reductive electrode reaction of the RupySAu, comparatively to the pySAu, hints that the π back-bonding effect enhances the chemisorption process. Contrary to that observed for the SAM of pyS on gold, the SERS spectra profiles acquired for the RupyS monolayer formed onto gold after longer immersion times indicated the absence of the structural conversion process.
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