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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). verify (what is ?) Infobox references

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.^[2] It rapidly hydrolyzes in air.^[1]

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.^[1] The Mn₂O⁶⁻
₆ anion has an Al₂Cl₆-type structure.^[1]^[2]

References

^ ^a ^b ^c ^d ^e Brachtel, G.; Hoppe, R. (1976), "Das erste Oxomanganat(III) mit Inselstruktur: K₆[Mn₂O₆]", Naturwissenschaften, 63 (7): 339, Bibcode:1976NW.....63..339B, doi:10.1007/BF00597313, S2CID 45344152.
^ ^a ^b Cotton, F. Albert; Wilkinson, Geoffrey (1980), Advanced Inorganic Chemistry (4th ed.), New York: Wiley, p. 741, ISBN 0-471-02775-8.