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
Density	3.6
Melting point	200-300 °C (decomposes)
Solubility in water	2.3 g·l−1 (19 °C)
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

^ ^a ^b 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)
^ ^a ^b Aterton Seidell (1940), Solubilities of Organic Compounds, vol. 1, p. 1438
^ 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
^ Groth, P. (Paul) (1877). Zeitschrift für Krystallographie und Mineralogie. New York Public Library. Leipzig : Wilhelm Engelmann.
^ 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.
^ ^a ^b 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

[Hoppe-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)

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

[Patterson-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.

[Gontarz-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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