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The adsorption of pyridine (Py) on Au(111) terraces produced from aqueous 0.1 M HClO 4 + 10 -3 M Py at 298 K was studied in the potential range 0.15 V E pze , as expected for a reversible potential-step-induced surface process. The surface concentration of adsorbed Py molecules resulting from the (4 x 4) lattice is close to 1 x 10 -9 mol/cm 2 , a figure exceeding the average integral surface concentration value obtained from electroadsorption measurements. Therefore, disordered domains would be related to a mobile diluted Py adsorbate coexisting with ordered Py adsorbate domains leading to a nonhomogeneous Py adsorbate layer at the positively charged Au(111) terraces.

Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control