Caesium permanganate

Caesium permanganate is the permanganate salt of caesium, with the chemical formula CsMnO4.

Caesium permanganate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.151.587
EC Number
  • 622-853-3
  • InChI=1S/Cs.Mn.4O/q+1;;;;;-1
    Key: HAHSACJTONBJGG-UHFFFAOYSA-N
  • [Cs+].[O-][Mn](=O)(=O)=O
Properties
CsMnO4
Molar mass 251.8406
Appearance purple crystals[1]
Density 3.6[1]
Melting point 200-300 °C (decomposes)
2.3 g·l−1 (19 °C)[2]
Structure
orthorhombic
Pnma (Nr. 62)
a = 1006 pm, b = 580.1 pm, c = 794.4 pm
Related compounds
Other anions
 caesium perchlorate
caesium periodate
caesium pertechnetate
Other cations
 lithium permanganate
sodium permanganate
potassium permanganate
rubidium permanganate
ammonium permanganate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

Caesium permanganate can be formed by the reaction of potassium permanganate and caesium nitrate:

CsNO3 + KMnO4 → KNO3 + CsMnO4 ↓

Properties

Physical

Caesium permanganate is soluble in water with a solubility of 0.97 g/L at 1 °C,[2] 2.3 g/L at 19 °C, and 12.5 g/L at 59 °C.[3] Its crystal structure is orthorhombic,[4] the same as rubidium permanganate, ammonium permanganate and potassium permanganate.

Chemical

Similar to potassium permanganate, the two-step decomposition of caesium permanganate leads to the formation of caesium manganate intermediates. It breaks down into manganese dioxide, caesium oxide and oxygen.[5] The decomposition temperature is between 200 and 300 °C.[6] Drift-away oxygen caused an 8% mass loss in the product.[6]

10CsMnO4 → 3Cs2MnO4 + 7MnO2 + 2Cs2O + 6O2 ↑
2Cs2MnO4 → 2MnO2 + 2Cs2O + O2 ↑

Total reaction:

4CsMnO4 → 4MnO2 + 2Cs2O + 3O2 ↑

References
  1. R. Hoppe, D. Fischer, J. Schneider (1999), "Zur Kenntnis von Oxyden A[MO4]: Über LiMnO4, KMnO4, RbMnO4, CsMnO4 sowie RbIO4 und CsIO4. (– Was heißt eigentlich "Die Kristallstruktur von …"? –)", Zeitschrift für anorganische und allgemeine Chemie, vol. 625, no. 7, pp. 1521–3749, doi:10.1002/(SICI)1521-3749(199907)625:7<1135::AID-ZAAC1135>3.0.CO;2-L{{citation}}: CS1 maint: multiple names: authors list (link)
  2. Aterton Seidell (1940), [Volltext Solubilities of Organic Compounds], vol. 1, p. 1438 {{citation}}: Check |url= value (help)
  3. Austin M. Patterson (1906), "Solubilities of Permanganates of the Alkali Metals", Journal of the American Chemical Society, vol. 28, no. 12, pp. 1734–1736, doi:10.1021/ja01978a009
  4. Groth, P. (Paul) (1877). Zeitschrift für Krystallographie und Mineralogie. New York Public Library. Leipzig : Wilhelm Engelmann.
  5. Beck, Michael W.; Brown, Michael E. (Jul 1983). "Thermal analysis of antimony/potassium permanganate pyrotechnic compositions". Thermochimica Acta. 65 (2–3): 197–212. doi:10.1016/0040-6031(83)80022-7.
  6. Z. Gontarz, B. Pisarska (September 1990), "Thermal decomposition stages of potassium, rubidium and caesium permanganates", Journal of Thermal Analysis and Calorimetry, vol. 36, no. 6, pp. 2113–2117, doi:10.1007/BF01914135, S2CID 95763664
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