Mercury(II) fluoride

Mercury(II) fluoride has the molecular formula HgF2 as a chemical compound of one atom of mercury with 2 atoms of fluorine.

Mercury(II) fluoride
Names
IUPAC name
Mercury(II) fluoride
Other names
Mercuric fluoride
Identifiers
ECHA InfoCard 100.029.085
EC Number
  • 231-994-6
UNII
Properties
HgF2
Molar mass 238.587 g/mol
Appearance hygroscopic white cubic crystals
Density 8.95 g/cm3
Melting point decomposes at 645°C
reacts[1]
−62.0·10−6 cm3/mol
Structure
Fluorite (cubic), cF12
Fm3m, No. 225
Hazards
Main hazards highly toxic
GHS pictograms
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 4: Very short exposure could cause death or major residual injury. E.g. VX gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
4
0
Related compounds
Other anions
 Mercury(II) chloride
Mercury(II) bromide
Mercury(II) iodide
Other cations
 Mercury(I) fluoride
Zinc fluoride
Cadmium fluoride
Thallium(I) fluoride
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

Synthesis

Mercury(II) fluoride is most commonly produced by the reaction of mercury(II) oxide and hydrogen fluoride:

HgO + 2 HF → HgF2 + H2O

Mercury(II) fluoride can also be produced through the fluorination of mercury(II) chloride:

HgCl2 + F2 → HgF2 + Cl2

or of mercury(II) oxide:[2]

2 HgO + 2 F2 → 2 HgF2 + O2

with oxygen as byproduct.

Applications

Mercury(II) fluoride is a selective fluorination agent.[3]

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References
  1. Lide, David R (1998), Handbook of Chemistry and Physics (87th ed.), Boca Raton, Florida: CRC Press, pp. 4–69, ISBN 0-8493-0594-2
  2. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  3. Habibi, Mohammed H.; Mallouk, Thomas E. (1991). "Photochemical selective fluorination of organic molecules using mercury (II) fluoride". Journal of Fluorine Chemistry. 51 (2): 291. doi:10.1016/S0022-1139(00)80299-7.


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