| Zinc fluoride | |
|---|---|
 |
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| Other names | Zinc difluoride |
| Identifiers | |
| CAS number | 7783-49-5  ,13986-18-0 (tetrahydrate) |
| PubChem | 24551 |
| RTECS number | ZH3200000 |
| Properties | |
| Molecular 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 (anhydrous) |
| Boiling point |
1500 °C (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 |
| Hazards | |
| EU Index | Not listed |
| NFPA 704 |
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| (what is this?) (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 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). [1] It has a high melting point and has the rutile structure containing 6 coordinate zinc, which suggests appreciable ionic character in its chemical bonding.[2] Unlike the other zinc halides, ZnCl2, ZnBr2 and ZnI2, it is not very soluble in water.[2]
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.[citation needed]
- The reaction of zinc metal with fluorine gas.[2]
- Reaction of hydrofluoric acid with zinc, to yield hydrogen gas (H2) and zinc fluoride (ZnF2).[2]
Zinc fluoride can be hydrolysed by hot water to form the zinc hydroxyfluoride, Zn(OH)F.[3]
References
- ^ Dale L. Perry, Sidney L. Phillips, 1995, Handbook of Inorganic Compounds, CRC Press, ISBN 0849386713
- ^ a b c d Greenwood, Norman N.; Earnshaw, A. (1997), Chemistry of the Elements (2nd ed.), Oxford: Butterworth-Heinemann, ISBN 0-7506-3365-4
- ^ Studies on metal hydroxy compounds. I. Thermal analyses of zinc derivatives ε-Zn(0H)2, Zn5(OH)8C12.H20, β- ZnOHC1, and ZnOHF, K SRIVASTAVA, EA SECCO - Canadian Journal of Chemistry, 1967 579-583
External links
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