Adsorption of Monolayers of P2Mo18O626- and Deposition of Multiple Layers of Os(bpy)32+−P2Mo18O626- on Electrode Surfaces

The unusually strong, irreversible adsorption of monolayer quantities of the P 2 Mo 18 O 62 6 - anion on glassy carbon, highly ordered pyrolytic graphite, indium tin oxide, and gold-coated quartz electrodes was examined by electrochemical, spectroelectrochemical, and quartz crystal microgravimetric techniques. A very simple method was developed to deposit multiple layers of composites consisting of alternating layers of the P 2 Mo 18 O 62 6 - anion and large, multiply-charged cations such as Os(bpy) 3 2+ . The resulting deposit is stable and exhibits electroactivity from both of the components that reflects the structure and ionic conductivity of the solid multilayer.