Caesium permanganate

Caesium permanganate

Identifiers
CAS Number	13456-28-5
3D model (JSmol)	Interactive image
ChemSpider	13198341
ECHA InfoCard	100.151.587
EC Number	622-853-3
PubChem CID	23674960
InChI InChI=1S/Cs.Mn.4O/q+1;;;;;-1 Key: HAHSACJTONBJGG-UHFFFAOYSA-N
SMILES [Cs+].[O-][Mn](=O)(=O)=O
Properties
Chemical formula	CsMnO4
Molar mass	251.8406
Appearance	purple crystals [1]
Density	3.6 [1]
Melting point	200-300 °C (decomposes)
Solubility in water	2.3 g·l−1 (19 °C) [2]
Structure
Crystal structure	orthorhombic
Space group	Pnma (Nr. 62)
Lattice constant	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

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

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
2. Aterton Seidell (1940), Solubilities of Organic Compounds, vol. 1, p. 1438
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