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

Potassium dimanganate(III)
Names
IUPAC name
potassium di-µ-oxidotetraoxidodimanganate(6−)
Identifiers
3D model (JSmol)
  • InChI=1S/6K.2Mn.6O/q6*+1;2*+3;6*-2
    Key: UXOXVZBXGUUTNN-UHFFFAOYSA-N
  • [K+].[K+].[K+].O=[Mn-3]0(=O)O[Mn-3](O0)(=O)=O.[K+].[K+].[K+]
Properties[1]
K6Mn2O6
Molar mass 440.46 g mol−1
Appearance Ruby-red crystals
Structure[1]
P21/b (No. 14)
a = 889(5) pm, b = 677(5) pm, c = 1137(9) pm
α = 90°, β = 90°, γ = 132.1°
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).
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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.[1] The Mn2O6−
6 anion has an Al2Cl6-type structure.[1][2]

References
  1. 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.
  2. Cotton, F. Albert; Wilkinson, Geoffrey (1980), Advanced Inorganic Chemistry (4th ed.), New York: Wiley, p. 741, ISBN 0-471-02775-8.
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