Caesium perchlorate

Caesium perchlorate[1][2]
IUPAC name Caesium perchlorate
Other names Cesium perchlorate
Identifiers
CAS number	13454-84-7 Y
PubChem	3035378
ChemSpider	109912 Y
EC number	236-643-0
Jmol-3D images	Image 1
SMILES [Cs+].[O-]Cl(=O)(=O)=O
InChI InChI=1S/ClHO4.Cs/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 Y Key: WKDKOOITVYKILI-UHFFFAOYSA-M Y InChI=1/ClHO4.Cs/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 Key: WKDKOOITVYKILI-REWHXWOFAB
Properties
Molecular formula	CsClO4
Molar mass	232.36 g/mol
Appearance	Colorless crystalls
Density	3.327 g/cm3
Melting point	250 °C decomp.
Solubility in water	1.974 g/100 ml (25 ºC)
Structure
Crystal structure	orthorhombic (<219 °C) cubic (>219 ºC, a = 798 pm)
Space group	Pnma (<219 °C) F43m (>219 ºC)
Lattice constant	a = 982 pm, b = 600 pm, c = 779 pm (orthorhombic, <219 °C)
Hazards
MSDS	External MSDS
EU Index	not listed
Flash point	non-flammable
Related compounds
Other anions	Caesium chloride Caesium chlorate
Other cations	Lithium perchlorate Sodium perchlorate Potassium perchlorate Rubidium perchlorate
Y perchlorate (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Caesium perchlorate, CsClO₄ (also known as cesium perchlorate), is a perchlorate of caesium. It forms white hygroscopic crystals, which are soluble in water and ethanol.

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 played an important role in the characterization of francium as an alkali metal, as francium perchlorate coprecipitates with caesium perchlorate.^[4]

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 caesium chloride above 250 °C. Like all perchlorates, it is a strong oxidant and may react violently with reducing agents and organic materials, especially at elevated temperatures.

References

1. ^ ^{a b} Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press .
2. ^ ^{a b} Brezina, F.; Mollin, J.; Pastorek, R.; Sindelar, Z. (1986), Chemicke tabulky anorganickych sloucenin, SNTL .
3. ^ Greenwood, Norman N.; Earnshaw, A. (1984). Chemistry of the Elements. Oxford: Pergamon. p. 1017. ISBN 0-08-022057-6. .
4. ^ Hyde, E. K. (1952), "Radiochemical Methods for the Isolation of Element 87 (Francium)", J. Am. Chem. Soc. 74 (16): 4181–84, doi:10.1021/ja01136a066 

External links

• Sigma-Aldrich MSDS