Electronic structures and electrochemistry of boronated cyanometalates

We have synthesized and structurally characterized a series of organoboron-modified cyanometalates. The redn. potentials of these modified metal complexes span an exceptionally wide range, owing to variations in the electronic properties of the appended organoboron derivs. Selected highly sol. redox pairs exhibit electrochem. reversibility over a 2.1 V range in non-aq. solvents, making them excellent candidates for non-aq. redox flow batteries. Our model flow battery systems exhibit near unity Coulombic efficiencies and high energy efficiencies.