Caesium fluoride
| Names | |
|---|---|
| IUPAC name
Caesium fluoride | |
| Other names
Cesium fluoride | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.033.156 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| CsF | |
| Molar mass | 151.903 g/mol |
| Appearance | white crystalline solid |
| Density | 4.64 g/cm3 |
| Melting point | 703 °C (1,297 °F; 976 K) |
| Boiling point | 1,251 °C (2,284 °F; 1,524 K) (2,284 °F; 1,524 K) |
| 573.0 g/100 mL (25 °C) | |
| Solubility | Insoluble in acetone, diethyl ether, pyridine and ethanol 191 g/100 mL in methanol. |
| Basicity (pKb) | −744 kJ/mol |
| −44.5·10−6 cm3/mol | |
Refractive index (nD) |
1.477 |
| Structure | |
| cubic, cF8 | |
| Fm3m, No. 225 | |
a = 0.6008 nm | |
Lattice volume (V) |
0.2169 nm3 |
Formula units (Z) |
4 |
| Octahedral | |
| 7.9 D | |
| Thermochemistry | |
Heat capacity (C) |
51.1 J/mol·K |
Std molar entropy (S⦵298) |
92.8 J/mol·K |
Std enthalpy of formation (ΔfH⦵298) |
−553.5 kJ/mol |
Gibbs free energy (ΔfG⦵) |
−525.5 kJ/mol |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
toxic |
| GHS labelling: | |
| Danger | |
| H301, H311, H315, H318, H331, H361f | |
| P201, P202, P260, P261, P264, P270, P271, P280, P281, P301+P310, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P308+P313, P310, P311, P312, P321, P322, P330, P332+P313, P361, P362, P363, P403+P233, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Other anions |
Caesium chloride Caesium bromide Caesium iodide Caesium astatide |
Other cations |
Lithium fluoride Sodium fluoride Potassium fluoride Rubidium fluoride Francium fluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Caesium fluoride (cesium fluoride in American English) is an inorganic compound with the formula CsF. A hygroscopic white salt, caesium fluoride is used in the synthesis of organic compounds as a source of the fluoride anion. The compound is noteworthy from the pedagogical perspective as caesium also has the highest electropositivity of all commonly available elements and fluorine has the highest electronegativity.