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Caesium perchlorate



Caesium perchlorate
IUPAC name Caesium perchlorate
Other names Cesium perchlorate
Identifiers
CAS number 13454-84-7
PubChem 3035378
EINECS number 236-643-0
SMILES [O-]Cl(=O)(=O)=O.[Cs+]
Properties
Molecular formula CsClO4
Molar mass 232.355 g.mol-1
Appearance Colorless crystalls
Density 3.327 g.cm-3[1]
Melting point

250 °C[1]

Solubility in water 1.974 g / 100 ml
Hazards
R-phrases R8
S-phrases S17
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Caesium perchlorate, CsClO4 (also known as cesium perchlorate), is a perchlorate of caesium. It forms white hygroscopic crystals in the solid state soluble in water and alcohol.

Additional recommended knowledge

Under temperature 219 °C it has orthorhombic structure Pnma with lattice constants a = 9.82, b = 6.00, c = 7.79 (.10-1 nm). Above 219 °C it crystallizes in cubic crystallic structure F43m with lattice constant a = 7.98 . 10-1 nm.[2]

CsClO4 is the least soluble of the alkali metal perchlorates (followed by Rb, K, Li, and Na), a property which may be used for separatory purposes and even for gravimetric analysis. [3] This low solubility is attributed to the formation of aggregates between the metal atom and the perchlorate anion.

Table of solubility in water[1][2]:

Temperature (°C) 0 8.5 14 25 40 50 60 70 99
Solubility (g / 100 ml) 0.8 0.91 1.91 1.974 3.694 5.47 7.30 9.79 28.57

When heated, CsClO4 decomposes to CsCl at 575 °C. Like all perchlorates, it is a strong oxidant and may react violently with reducing agents and organic materials, especially at elevated temperatures.

Caesium perchlorate helped in discovering francium and identifying it as an alkali metal because francium-223 coprecipitated with cesium perchlorate.[4][5]

See also

References

  1. ^ a b c Dale L. Perry, Sidney L. Phillips. Handbook of Inorganic Compounds. CRC Press, 1995
  2. ^ a b F. Brezina, J. Mollin, R. Pastorek, Z. Sindelar. Chemicke tabulky anorganickych sloucenin (Chemical tables of inorganic compounds). SNTL, 1986.
  3. ^ A. Earnshaw, Norman Greenwood. Chemistry of the Elements, Second Edition. Butterworth-Heinemann, 1997
  4. ^ Martin Ambrose Paul, Edward Jasper King, Larkin Hundley Farinholt. General Chemistry. Harcourt, Brace & World, 1967. D. E. Barnes. Newnes Concise Encyclopaedia of Nuclear Energy. G. Newnes, 1962.
  5. ^ E. K. Hyde (1952). "Radiochemical Methods for the Isolation of Element 87 (Francium)". J. Am. Chem. Soc. 74 (16): 4181-4184. doi:10.1021/ja01136a066.
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Caesium_perchlorate". A list of authors is available in Wikipedia.
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