FD simulations of the voltammetric response for direct C2O4 2-oxidation (eqs 5-10) are described elsewhere, with parameters obtained from that study shown in Table . Upon addition of C2O4 2-to the solution containing 0.9 mM DiMeFc, direct C2O4 2-oxidation is observed in the simulations at ~ -0.5 V vs Fc/Fc + , consistent with the experimental results shown in Figures and. and.