Caesium perchlorate

Caesium perchlorate^[1]^[2]
Names
	IUPAC name Caesium perchlorate
	Other names Cesium perchlorate
Identifiers
CAS Number	13454-84-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	109912 ;
ECHA InfoCard	100.033.298
EC Number	236-643-0;
PubChem CID	3035378;
CompTox Dashboard (EPA)	DTXSID50884610 ;
	InChI InChI=1S/ClHO4.Cs/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 Key: WKDKOOITVYKILI-UHFFFAOYSA-M ; InChI=1/ClHO4.Cs/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 Key: WKDKOOITVYKILI-REWHXWOFAB;
	SMILES [Cs+].[O-]Cl(=O)(=O)=O;
Properties
Chemical formula	CsClO4
Molar mass	232.36 g/mol
Appearance	Colorless crystals
Density	3.327 g/cm3
Melting point	250 °C (482 °F; 523 K) (decomposes)
Solubility in water	1.974 g/100 ml (25 °C)
Solubility product (Ksp)	3.95×10−3
Refractive index (nD)	1.4887
Structure
Crystal structure	orthorhombic (<219 °C); cubic (>219 °C, a = 798 pm)
Space group	Pnma (<219 °C); F43m (>219 °C)
Lattice constant	a = 982 pm, b = 600 pm, c = 779 pm (orthorhombic, <219 °C)
Hazards
Safety data sheet (SDS)	External MSDS
Flash point	Non-flammable
Related compounds
Other anions	Caesium chloride;
Other cations	Lithium perchlorate; Sodium perchlorate; Potassium perchlorate; Rubidium perchlorate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Caesium perchlorate or cesium perchlorate (CsClO₄), is a perchlorate of caesium. It forms white crystals, which are sparingly soluble in cold water and ethanol. It dissolves more easily in hot water.

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. ^[4] This low solubility played an important role in the characterization of francium as an alkali metal, as francium perchlorate coprecipitates with caesium perchlorate.^[5]

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[]

^ ^a ^b Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press.
^ ^a ^b Brezina, F.; Mollin, J.; Pastorek, R.; Sindelar, Z. (1986), Chemicke tabulky anorganickych sloucenin, SNTL.
^ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
^ Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. p. 1017. ISBN 978-0-08-022057-4..
^ 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, hdl:2027/mdp.39015086483156