Abstract
Surface-enhanced Raman spectroscopy has been used to study the surface chemistry of thiosemicarbazide (TSC) on silver and copper electrodes under different pH's and in different supporting electrolytes. TSC molecules are found to adsorb on these metal surfaces through the S atoms. The resulting CS stretching frequency shifts are similar to those in the monodentate metallic TSC complexes. Low frequency modes attributed to ϱ(AgS) and ϱ(CuS) are studied in different electrolyte solutions. Remarkably different spectra of TSC are observed upon a decrease in the pH of the solution. This change is due to (1) the protonation of TSC and (2) an electrochemical reduction of the protonated TSC at the electrode surface which produced thiourea.
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