Difference between revisions of "Potassium dimanganite"
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| − | '''Potassium dimanganite''', K<sub>6</sub>Mn<sub>2</sub>O<sub>6</sub>, is a manganese(III) compound. Unlike [[Lithium manganite|lithium]] and [[sodium manganite]]s, MMnO<sub>2</sub>, which are best described as [[mixed oxide]]s, potassium dimanganite contains discrete Mn<sub>2</sub>O{{su|b=6|p=6−}} anions in the solid state.<ref name="C&W">{{Cotton&Wilkinson4th|page=741}}.</ref> It | + | '''Potassium dimanganite''', K<sub>6</sub>Mn<sub>2</sub>O<sub>6</sub>, is a manganese(III) compound. Unlike [[Lithium manganite|lithium]] and [[sodium manganite]]s, MMnO<sub>2</sub>, which are best described as [[mixed oxide]]s, potassium dimanganite contains discrete Mn<sub>2</sub>O{{su|b=6|p=6−}} anions in the solid state.<ref name="C&W">{{Cotton&Wilkinson4th|page=741}}.</ref> It rapidly [[Hydrolysis|hydrolyzes]] in air.<ref name="Brachtel"/> |
K<sub>6</sub>Mn<sub>2</sub>O<sub>6</sub> 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.<ref name="Brachtel"/> The Mn<sub>2</sub>O{{su|b=6|p=6−}} anion has a Al<sub>2</sub>Cl<sub>6</sub>-type structure.<ref name="Brachtel"/><ref name="C&W"/> | K<sub>6</sub>Mn<sub>2</sub>O<sub>6</sub> 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.<ref name="Brachtel"/> The Mn<sub>2</sub>O{{su|b=6|p=6−}} anion has a Al<sub>2</sub>Cl<sub>6</sub>-type structure.<ref name="Brachtel"/><ref name="C&W"/> | ||
Revision as of 12:21, 26 June 2010
| Potassium dimanganite | |
|---|---|
| IUPAC name | potassium di-µ-oxidotetraoxidodimanganate(6−) |
| Properties[1] | |
| Chemical formula | K6Mn2O6 |
| Molar mass | 440.46 g mol−1 |
| Appearance | Ruby-red crystals |
| Structure | |
| Space group | P21/b |
| Lattice constant | a = 889(5) pm, b = 677(5) pm, c = 1137(9) pm, α = 90°, β = 90°, γ = 132.1° |
| Coordination geometry | 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 a Al2Cl6-type structure.[1][2]
References
- ↑ 1.0 1.1 1.2 1.3 Brachtel, G.; Hoppe, R. Das erste Oxomanganat(III) mit Inselstruktur: K6[Mn2O6]. Naturwissenschaften 1976, 63 (7), 339. DOI: 10.1007/BF00597313.
- ↑ 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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