|Molar mass||440.46 g mol−1|
|Space group||P21/b (No. 14)|
|Lattice constant||a = 889(5) pm, b = 677(5) pm, c = 1137(9) pm|
|Lattice constant||α = 90°, β = 90°, γ = 132.1°|
|Distorted tetrahedral (Mn3+)|
|Other anions||Potassium hypomanganate
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Potassium dimanganate(III), K6Mn2O6, is a manganese(III) compound. Unlike lithium and sodium manganites, MMnO2, which are best described as mixed oxides, potassium dimanganite contains discrete Mn2O6−
6 anions in the solid state. It rapidly hydrolyzes in air.
K6Mn2O6 is prepared as ruby-red crystals by the reaction of excess potassium oxide with manganese(II) oxide in a sealed nickel bomb at 610 °C for ten days. The Mn2O6−
6 anion has an Al2Cl6-type structure.