{MV13} was synthesized based on the synthetic method reported recently by some of us (for synthesis and characterization, also see Supporting Information). Here, we first explored the fundamental electrochemical performance of {MV13} in acetonitrile under the targeted NRFB conditions. To this end, we utilized a three-electrode cell equipped with a glassy carbon (GC) working electrode, a platinum counter electrode, and a nonaqueous Ag/AgNO3 reference electrode. The potentials were converted to the Fc + /Fc scale using ferrocene as internal standard. For experimental details see SI. An acetonitrile solution containing {MV13} (1 mM) as active species and (nBu4N)4PF6 (0.1 M) as supporting electrolyte used. cyclic voltammetry (CV) and square-wave voltammetry show the general {MV13} redox processes within the potential range between -2.0 V and 1.0 V vs. Fc + /Fc. This range was chosen based on the stability range of the carbon electrodes to be used for the final RFB setup, see below. The data shows that within this range, 12 redox transitions are observed (green labels in Figure and).