Caesium permanganate
{{Chembox
| ImageFile= Caesiumpermanganat.png
| ImageFile2 = Crystals_CsMnO4.png
|Section3={{Chembox Structure
| CrystalStruct = orthorhombic
| SpaceGroup = Pnma (Nr. 62)
| LattConst_a =1006 pm
|LattConst_b=580.1 pm
| LattConst_c=794.4 pm
}}
|Section1={{Chembox Identifiers
| CASNo = 13456-28-5
| ChemSpiderID = 13198341
| PubChem = 23674960
| EC_number = 622-853-3
| StdInChI=1S/Cs.Mn.4O/q+1;;;;;-1
| StdInChIKey = HAHSACJTONBJGG-UHFFFAOYSA-N
| SMILES=[Cs+].[O-][Mn](=O)(=O)=O
}}
|Section2={{Chembox Properties
| Formula=CsMnO4
| Appearance= purple crystals{{citation|author=R. Hoppe, D. Fischer, J. Schneider|date=1999|doi=10.1002/(SICI)1521-3749(199907)625:7<1135::AID-ZAAC1135>3.0.CO;2-L|issue=7|pages=1521–3749|periodical=Zeitschrift für anorganische und allgemeine Chemie|title=Zur Kenntnis von Oxyden A[MO4]: Über LiMnO4, KMnO4, RbMnO4, CsMnO4 sowie RbIO4 und CsIO4. (– Was heißt eigentlich "Die Kristallstruktur von …"? –)|volume=625}}
| MolarMass = 251.8406
| MeltingPt= 200-300 °C (decomposes)
| Solubility= 2.3 g·l−1 (19 °C)
}}
| Section8={{Chembox Related
| OtherCations =lithium permanganate
sodium permanganate
potassium permanganate
rubidium permanganate
ammonium permanganate
| OtherAnions=caesium perchlorate
caesium periodate
caesium pertechnetate
}}
}}
Caesium permanganate is the permanganate salt of caesium, with the chemical formula {{chem2|CsMnO4}}.
Preparation
Caesium permanganate can be formed by the reaction of potassium permanganate and caesium nitrate:
:{{chem2| CsNO3 + KMnO4 -> KNO3 + CsMnO4 ↓ }}
Properties
= Physical =
Caesium permanganate is soluble in water with a solubility of 0.97 g/L at 1 °C,{{citation|author=Aterton Seidell|date=1940|pages=1438|title=Solubilities of Organic Compounds|url=http://www.archive.org/stream/solubilitiesofor023311mbp#page/n933/mode/2up%20Volltext |volume=1}} 2.3 g/L at 19 °C, and 12.5 g/L at 59 °C.{{citation|author=Austin M. Patterson|date=1906|doi=10.1021/ja01978a009|issue=12|pages=1734–1736|periodical=Journal of the American Chemical Society|title=Solubilities of Permanganates of the Alkali Metals|volume=28|url=https://zenodo.org/record/1428880 }} Its crystal structure is orthorhombic,{{Cite book |last=Groth |first=P. (Paul) |url=http://archive.org/details/zeitschriftfrkr19grotgoog |title=Zeitschrift für Krystallographie und Mineralogie |date=1877 |publisher=Leipzig : Wilhelm Engelmann |others=New York Public Library}} 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.{{Cite journal |last1=Beck |first1=Michael W. |last2=Brown |first2=Michael E. |date=Jul 1983 |title=Thermal analysis of antimony/potassium permanganate pyrotechnic compositions |url=https://linkinghub.elsevier.com/retrieve/pii/0040603183800227 |journal=Thermochimica Acta |language=en |volume=65 |issue=2–3 |pages=197–212 |doi=10.1016/0040-6031(83)80022-7}} The decomposition temperature is between 200 and 300 °C.{{citation|author=Z. Gontarz, B. Pisarska|date=September 1990|doi=10.1007/BF01914135|issue=6|pages=2113–2117|periodical=Journal of Thermal Analysis and Calorimetry|title=Thermal decomposition stages of potassium, rubidium and caesium permanganates|volume=36|s2cid=95763664 }} Drift-away oxygen caused an 8% mass loss in the product.
:{{chem2| 10CsMnO4 -> 3Cs2MnO4 + 7MnO2 + 2Cs2O + 6O2 ↑ }}
:{{chem2| 2Cs2MnO4 -> 2MnO2 + 2Cs2O + O2 ↑ }}
Total reaction:
:{{chem2| 4CsMnO4 -> 4MnO2 + 2Cs2O + 3O2 ↑ }}
References
{{reflist}}
{{Caesium compounds}}
{{Permanganates}}