Experimental evidence of the variation in redox potential of osmium pyridine complexes tethered to a Au surface by thiol or diazonium chemistry at different ionic concentration and electrolyte pH is described. The interplay between the charged redox and acid groups is described by a charge regulation model based on PM-IRRAS spectroscopic evidence on the different degrees of surface protonation.
A. M. Ricci, M. Tagliazucchi and E. J. Calvo, Phys. Chem. Chem. Phys., 2012, 14, 9988 DOI: 10.1039/C2CP40695K
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