Mercury(II) fluoride
Mercury(II) fluoride
IUPAC name
Mercury(II) fluoride
Other names
Mercuric fluoride
3D model (JSmol)
ECHA InfoCard 100.029.085 Edit this at Wikidata
EC Number
  • 231-994-6
  • InChI=1S/2FH.Hg/h2*1H;/q;;+2/p-2
  • F[Hg]F
Molar mass 238.587 g/mol
Appearance hygroscopic white cubic crystals
Density 8.95 g/cm3
Melting point decomposes at 645°C
−62.0·10−6 cm3/mol
Fluorite (cubic), cF12
Fm3m, No. 225
Occupational safety and health (OHS/OSH):
Main hazards
highly toxic
GHS labelling:
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
H300, H310, H330, H373, H410
P301+P310, P304+P340, P320, P330, P360, P361, P405, P501[2]
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
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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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 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:[3]

2 HgO + 2 F2 → 2 HgF2 + O2

with oxygen as byproduct.


Mercury(II) fluoride is a selective fluorination agent.[4]


  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. ^ "Mercury(II) fluoride MSDS". ThermoFisher Scientific. Retrieved 2022-02-02.
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  4. ^ 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.