Blue Acid Chemistry (12): K5[Co2O2Bl10].H2O

Hmm... To be honest, the whole series of the Co-Bl complexes are very confusing, especially about the colors. But we have to go advance. In this complex, the bridge is a superoxo ligand, which contains an O-O 1.5 bond and bears 1 negative charges. Structure is still very similar to (8) . Reference is still the same as (8). Those papers claimed it to be a Co(III,IV) complex with a peroxo ligand which is of course very absurd. 2[Co2O2Bl10]6- + ClO- + H2O = 2[Co2O2Bl10]5- + Cl- + 2OH- 2g(0.036mol) KOH was dissolved into 10mL water to form a strongly basic solution. Then, 1.65g(0.0025mol) K6[Co2O2Bl10].H2O was dissolved into it to form a deeply reddish-brown solution. 3mL bleach(~4% NaClO, ~0.0016mol) was added. Quickly, the solution turned into a nice red. EtOH was added, initially very carefully with quick stirring to prevent oil formation, then large amount was added. Solution separated into a pink solution and some reddish-brown solid. Filter to collect the solid. Solid was dried ...