Potassium manganate

This green-colored salt is an intermediate in the industrial synthesis of potassium permanganate (KMnO4), a common chemical.

X-ray crystallography shows that the anion is tetrahedral, with Mn-O distances of 1.66 Å, ca.

The compound is paramagnetic, owing to the presence of one unpaired electron on the Mn(VI) center.

The industrial route entails treatment of MnO2 with air and potassium hydroxide:[1] The transformation gives a green-colored melt.

This reaction also shows that manganate(VII) can serve as an electron acceptor in addition to its usual role as an oxygen-transfer reagent.

NFPA 704 four-colored diamond Health 1: Exposure would cause irritation but only minor residual injury. E.g. turpentine Flammability 0: Will not burn. E.g. water Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium Special hazard OX: Oxidizer. E.g. potassium perchlorate