Left: Cyclic voltammograms of the co-catalyst mixture (black), Re(dacbpy)(CO)3Cl (red), and Mn(dacbpy)(CO)3Br (blue) taken in DMF under Ar saturation. Right: responses of Re(dacbpy)(CO)3Cl and Mn(dacbpy)(CO)3Br as a co-catalyst mixture under Ar in MeCN (red) and DMF (black). Reproduced from ref. 160 with permission from the Royal Society of Chemistry.