Potassium dimanganate(III), K₆Mn₂O₆, is a manganese(III) compound. Unlike

lithium Lithium (from el, λίθος, lithos, lit=stone) is a chemical element with the symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the least dense metal and the least dense solid ...

and sodium manganites, MMnO₂, which are best described as mixed oxides, potassium dimanganite contains discrete Mn₂O anions in the solid state.. It rapidly

hydrolyzes Hydrolysis (; ) is any chemical reaction in which a molecule of water breaks one or more chemical bonds. The term is used broadly for substitution, elimination, and solvation reactions in which water is the nucleophile. Biological hydrolysi ...

in air. K₆Mn₂O₆ is prepared as ruby-red crystals by the reaction of excess

potassium oxide Potassium oxide ( K O) is an ionic compound of potassium and oxygen. It is a base. This pale yellow solid is the simplest oxide of potassium. It is a highly reactive compound that is rarely encountered. Some industrial materials, such as fertili ...

with

manganese(II) oxide Manganese(II) oxide is an inorganic compound with chemical formula MnO.Arno H. Reidies "Manganese Compounds" Ullmann's Encyclopedia of Chemical Technology 2007; Wiley-VCH, Weinheim. It forms green crystals. The compound is produced on a large s ...

in a sealed

nickel Nickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive but large pieces are slow ...

bomb at 610 °C for ten days. The Mn₂O anion has an Al₂Cl₆-type structure.

References

{{Manganese compounds Potassium compounds Manganese(III) compounds