Caesium permanganate is the permanganate salt of caesium, with the chemical formula CsMnO4.
| |
| |
| Identifiers | |
|---|---|
3D model (JSmol)
|
|
| ChemSpider | |
| ECHA InfoCard | 100.151.587 |
| EC Number |
|
PubChem CID
|
|
| |
| |
| 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).
| |
Preparation
editCaesium permanganate can be formed by the reaction of potassium permanganate and caesium nitrate:
- CsNO3 + KMnO4 → KNO3 + CsMnO4 ↓
Properties
editPhysical
editCaesium 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
editSimilar 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
edit- ^ 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