Abstract
Surface-enhanced Raman scattering (SERS) of ortho- and para-mercaptophenols has been investigated in aqueous silver sol. Regardless of the solution pH and concentration, both molecules were found to adsorb on the sol surface via their sulfur atoms after losing sulfhydryl protons. Under very basic and submonolayer coverage conditions, the ortho isomer appeared also to bind to silver via its oxygen atom as o-sulfidophenoxide. Otherwise, the benzene rings and the hydroxyl groups of both isomers seemed to be pendant to the silver surface. From the present work, it seemed possible to investigate the adsorption of weak ligands to metal by SERS with the aid of nearby stronger ligands.
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