Potassium dimanganate(III)

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.

Potassium dimanganate(III)

Names
IUPAC name potassium di-µ-oxidotetraoxidodimanganate(6−)
Identifiers
3D model (JSmol)	Interactive image
PubChem CID	139046909
InChI InChI=1S/6K.2Mn.6O/q6*+1;2*+3;6*-2 Key: UXOXVZBXGUUTNN-UHFFFAOYSA-N
SMILES [K+].[K+].[K+].O=[Mn-3]0(=O)O[Mn-3](O0)(=O)=O.[K+].[K+].[K+]
Properties
Chemical formula	K6Mn2O6
Molar mass	440.46 g mol−1
Appearance	Ruby-red crystals
Structure
Space group	P21/b (No. 14)
Lattice constant	a = 889(5) pm, b = 677(5) pm, c = 1137(9) pm α = 90°, β = 90°, γ = 132.1°
Coordination geometry	Distorted tetrahedral (Mn3+)
Related compounds
Other anions	Potassium hypomanganate Potassium manganate Potassium permanganate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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.