Caesium permanganate

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

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

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 ↑