Potassium dimanganite

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Potassium dimanganite
IUPAC name potassium di-µ-oxidotetraoxidodimanganate(6−)
Identifiers
InChI InChI=1/6K.2Mn.6O/q6*+1;2*-3;;;;;;
Properties[1]
Chemical formula K6Mn2O6
Molar mass 440.46 g mol−1
Appearance Ruby-red crystals
Structure[1]
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
Other cations Lithium manganite
Sodium manganite
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Potassium dimanganite, 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

  1. 1.0 1.1 1.2 1.3 1.4 Brachtel, G.; Hoppe, R. Das erste Oxomanganat(III) mit Inselstruktur: K6[Mn2O6]. Naturwissenschaften 1976, 63 (7), 339. DOI: 10.1007/BF00597313.
  2. 2.0 2.1 Cotton, F. Albert; Wilkinson, Geoffrey Advanced Inorganic Chemistry, 4th ed.; Wiley: New York, 1980; p 741. ISBN 0-471-02775-8.
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