Zinc fluoride

Zinc fluoride

Zinc fluoride
Names
Other names Zinc difluoride
Identifiers
CAS Number	7783-49-5 Y 13986-18-0 (tetrahydrate)
ChemSpider	22957 Y
Jmol 3D model	Interactive image
PubChem	24551
RTECS number	ZH3200000
InChI InChI=1S/2FH.Zn/h2*1H;/q;;+2/p-2 Y Key: BHHYHSUAOQUXJK-UHFFFAOYSA-L Y InChI=1/2FH.Zn/h2*1H;/q;;+2/p-2 Key: BHHYHSUAOQUXJK-NUQVWONBAR
SMILES F[Zn]F
Properties
Chemical formula	ZnF2
Molar mass	103.406 g/mol (anhydrous) 175.45 g/mol (tetrahydrate)
Appearance	white needles hygroscopic
Density	4.95 g/cm3 (anhydrous) 2.30 g/cm3 (tetrahydrate)
Melting point	872 °C (1,602 °F; 1,145 K) (anhydrous) 100 °C, decomposes (tetrahydrate)
Boiling point	1,500 °C (2,730 °F; 1,770 K) (anhydrous)
Solubility in water	.000052 g/100 mL (anhydrous) 1.52 g/100 mL, 20 °C (tetrahydrate)
Solubility	sparingly soluble in HCl, HNO3, ammonia
Structure
Crystal structure	tetragonal (anhydrous), tP6
Space group	P42/mnm, No. 136
Vapor pressure	{{{value}}}
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

Zinc fluoride (ZnF₂) is an inorganic chemical compound. It is encountered as the anydrous form and also as the tetrahydrate, ZnF₂ · 4H₂O (rhombohedral crystal structure). It has a high melting point and has the rutile structure containing 6 coordinate zinc, which suggests appreciable ionic character in its chemical bonding. Unlike the other zinc halides, ZnCl₂, ZnBr₂ and ZnI₂, it is not very soluble in water.

Preparation and reactions

Zinc fluoride can be synthesized several ways.

• Reaction of a fluoride salt with zinc chloride, to yield zinc fluoride and a chloride salt, in aqueous solution.
• The reaction of zinc metal with fluorine gas.
• Reaction of hydrofluoric acid with zinc, to yield hydrogen gas (H₂) and zinc fluoride (ZnF₂).

Zinc fluoride can be hydrolysed by hot water to form the zinc hydroxyfluoride, Zn(OH)F.