Chemistry:Caesium permanganate
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3D model (JSmol)
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| 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
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| Related compounds | |
Other anions
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caesium perchlorate caesium periodate caesium pertechnetate |
Other cations
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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 CsMnO
4.
Preparation
Caesium permanganate can be formed by the reaction of potassium permanganate and caesium nitrate:
- CsNO
3 + KMnO
4 → KNO
3 + CsMnO
4 ↓
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]
- 10CsMnO
4 → 3Cs
2MnO
4 + 7MnO
2 + 2Cs
2O + 6O
2 ↑ - 2Cs
2MnO
4 → 2MnO
2 + 2Cs
2O + O
2 ↑
Total reaction:
- 4CsMnO
4 → 4MnO
2 + 2Cs
2O + 3O
2 ↑
References
- ↑ 1.0 1.1 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 625 (7): 1521–3749, doi:10.1002/(SICI)1521-3749(199907)625:7<1135::AID-ZAAC1135>3.0.CO;2-L
- ↑ 2.0 2.1 Aterton Seidell (1940), [Volltext Solubilities of Organic Compounds], 1, pp. 1438, Volltext
- ↑ Austin M. Patterson (1906), "Solubilities of Permanganates of the Alkali Metals", Journal of the American Chemical Society 28 (12): 1734–1736, doi:10.1021/ja01978a009, https://zenodo.org/record/1428880
- ↑ Groth, P. (Paul) (1877). Zeitschrift für Krystallographie und Mineralogie. New York Public Library. Leipzig : Wilhelm Engelmann. http://archive.org/details/zeitschriftfrkr19grotgoog.
- ↑ Beck, Michael W.; Brown, Michael E. (Jul 1983). "Thermal analysis of antimony/potassium permanganate pyrotechnic compositions" (in en). Thermochimica Acta 65 (2–3): 197–212. doi:10.1016/0040-6031(83)80022-7. https://linkinghub.elsevier.com/retrieve/pii/0040603183800227.
- ↑ 6.0 6.1 Z. Gontarz, B. Pisarska (September 1990), "Thermal decomposition stages of potassium, rubidium and caesium permanganates", Journal of Thermal Analysis and Calorimetry 36 (6): 2113–2117, doi:10.1007/BF01914135
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