Voltametric measurements employed a three-electrode system, with a Pt/Ti auxiliary electrode and an Ag/AgCl reference electrode. Voltammograms were measured in acetonitrile with 0.25 M TBAPF6 as a supporting electrolyte and a scan rate of 250 mVs -1 . Attempts to measure voltammograms at slower scan rates were unsuccessful with all samples due to desorption of the sample on the electrode surface. All measurements were referenced to an internal ferrocene/ferrocenium (Fc/Fc + ) standard. Upon completion of the measurements, a blank voltammogram was obtained using a clean glassy carbon electrode to confirm no dissolution of any compounds throughout the measurement.