Abstract
The Adsorbed structure of mercaptobenzothiazole (MBT) at silver and copper electrode surfaces was investigated in situ by surface-enhanced Raman scattering (SERS). The molecule has a thione-type structure in acidic solutions of pH 9. Both types of MBT strongly adsorb on the electrodes through the sulfur atom. When thione-type MBT is adsorbed, the proton at the nitrogen atom is dissociated. In very strongly acidic solutions of pH<1, however, the adsorbed molecule is partly protonated. The protonation is enhanced by co-adsorbed halogen ions. The adsorbed MBT lies nearly flat at low coverages and stands nearly normal to the surface at high coverages.
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