CAS No.7647-17-8 Cesium chloride

Cesium chloride

Name Cesium chloride
CAS Registry Number 7647-17-8
Synonyms Cesium chloride (CsCl);Cesium monochloride;cesiumchloride(cscl);cesiummonochloride;Dicesium dichloride;dicesiumdichloride;Tricesium trichloride;tricesiumtrichloride
Molecular Structure Cesium chloride  7647-17-8
Molecular Formula ClCs
Molecular Weight 168.36
mp: 645 ℃(lit.)
Hazard Codes: Details
Risk Statements: 68-36/38
Safety Statements: 36/37-26
RIDADR: 2923
HS Code: 28273980

CAS 7647-17-8 Wiki / 7647-17-8 MSDS

Caesium chloride
Caesium chloride.jpg
CsCl polyhedra.png
IUPAC name
Caesium chloride
Other names
Cesium chloride
CAS Number
  • 7647-17-8 YesY
3D model (JSmol)
  • Interactive image
  • 22713 YesY
ECHA InfoCard 100.028.728
EC Number 231-600-2
PubChem CID
  • 24943
Chemical formula
Molar mass 168.36 g/mol
Appearance white solid
Density 3.988 g/cm3[1]
Melting point 646 °C (1,195 °F; 919 K)[1]
Boiling point 1,297 °C (2,367 °F; 1,570 K)[1]
Solubility in water
1910 g/L (25 °C)[1]
Solubility soluble in ethanol[1]
Band gap 8.35 eV (80 K)[2]
Magnetic susceptibility (χ)
-56.7·10−6 cm3/mol[3]
Refractive index (nD)
1.712 (0.3 µm)
1.640 (0.59 µm)
1.631 (0.75 µm)
1.626 (1 µm)
1.616 (5 µm)
1.563 (20 µm)[4]
Crystal structure
CsCl, cP2
Space group
Pm3m, No. 221[5]
Lattice constant
a = 0.4119 nm
Lattice volume (V)
0.0699 nm3
Formula units (Z)
Coordination geometry
Cubic (Cs+)
Cubic (Cl)
Lethal dose or concentration (LD, LC):
LD50 (median dose)
2600 mg/kg (oral, rat)[6]
Related compounds
Other anions
Caesium fluoride
Caesium bromide
Caesium iodide
Caesium astatide
Other cations
Lithium chloride
Sodium chloride
Potassium chloride
Rubidium chloride
Francium chloride
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 chloride or cesium chloride, is the inorganic compound with the formula CsCl. This colorless solid is an important source of caesium ions in a variety of niche applications. Its crystal structure forms a major structural type where each caesium ion is coordinated by 8 chlorine ions. Caesium chloride dissolves in water. Caesium chloride occurs naturally as impurities in carnallite (up to 0.002%), sylvite and kainite. Less than 20 tonnes of CsCl is produced annually worldwide, mostly from a caesium-bearing mineral pollucite.[7]

Caesium chloride is widely used medicine structure in isopycnic centrifugation for separating various types of DNA. It is a reagent in analytical chemistry, where it is used to identify ions by the color and morphology of the precipitate. When enriched in radioisotopes, such as 137CsCl or 131CsCl, caesium chloride is used in nuclear medicine applications such as treatment of cancer and diagnosis of myocardial infarction. Another form of cancer treatment was studied using conventional non-radioactive CsCl. Whereas conventional caesium chloride has a rather low toxicity to humans and animals, the radioactive form easily contaminates the environment due to the high solubility of CsCl in water. Spread of 137CsCl powder from a 93-gram container in 1987 in Goiânia, Brazil, resulted in one of the worst-ever radiation spill accidents killing four and directly affecting more than 100,000 people.