Zinc fluoride

Zinc fluoride
Names
	IUPAC name Zinc(II) fluoride
	Other names Zinc difluoride
Identifiers
CAS Number	7783-49-5 ; 13986-18-0 (tetrahydrate) ;
3D model ( JSmol )	Interactive image ;
ChemSpider	22957 ;
ECHA InfoCard	100.029.092
EC Number	232-001-9 ;
PubChem CID	24551 ;
RTECS number	ZH3200000 ;
UNII	L9V334775I ; SQ7815WXFB (tetrahydrate) ;
UN number	3077
CompTox Dashboard ( EPA )	DTXSID20894882 ;
	InChI InChI=1S/2FH.Zn/h2*1H;/q;;+2/p-2 Key: BHHYHSUAOQUXJK-UHFFFAOYSA-L ;
	SMILES F[Zn]F ;
Properties
Chemical formula	ZnF 2
Molar mass	103.406 g/mol (anhydrous) ; 175.45 g/mol (tetrahydrate)
Appearance	white needles ; hygroscopic
Density	4.95 g/cm 3 (anhydrous) ; 2.30 g/cm 3 (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 , HNO 3 , ammonia
Magnetic susceptibility (χ)	−38.2·10 ?6 cm 3 /mol
Structure
Crystal structure	tetragonal (anhydrous), tP6
Space group	P4 2 /mnm, No. 136
Hazards
	GHS labelling :
Pictograms
Signal word	Danger
Hazard statements	H301 , H315 , H318 , H335
Precautionary statements	P261 , P264 , P270 , P271 , P280 , P301+P310 , P302+P352 , P304+P340 , P305+P351+P338 , P310 , P312 , P330 , P332+P313 , P337+P313 , P362 , P403+P233 , P405 , P501
NFPA 704 (fire diamond)	3 0 0
Related compounds
Other anions	Zinc(II) bromide ; Zinc(II) chloride ; Zinc(II) iodide ;
Other cations	Cadmium(II) fluoride ; Mercury(II) fluoride ;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify ( what is ?) Infobox references

Zinc fluoride is an inorganic chemical compound with the chemical formula Zn F ₂. It is encountered as the anhydrous form and also as the tetrahydrate , ZnF ₂·4H ₂O (rhombohedral crystal structure). ^[2] It has a high melting point and has the rutile structure containing 6 coordinate zinc, which suggests appreciable ionic character in its chemical bonding. ^[3] Unlike the other zinc halides, ZnCl ₂, ZnBr ₂ and ZnI ₂, it is not very soluble in water. ^[3]

Like some other metal difluorides, ZnF ₂ crystallizes in the rutile structure, which features octahedral Zn cations and trigonal planar fluorides . ^[4]

Preparation and reactions [ edit ]

Zinc fluoride can be synthesized several ways.

The reaction of zinc metal with fluorine gas. ^[3]
Reaction of hydrofluoric acid with zinc, to yield hydrogen gas ( H ₂) and zinc fluoride ( ZnF ₂). ^[3]

Zinc fluoride can be hydrolysed by hot water to form the zinc hydroxide fluoride, Zn(OH)F. ^[5]

The salt is believed to form both a tetrahydrate and a dihydrate. ^[6]

References [ edit ]

^ "ZINC fluoride" . pubchem.ncbi.nlm.nih.gov .
^ Perry, D. L.; Phillips, S. L. (1995). Handbook of Inorganic Compounds . CRC Press. ISBN 0-8493-8671-3 .
^ ^a ^b ^c ^d Greenwood, Norman N. ; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann . ISBN 978-0-08-037941-8 .
^ Stout, J. W.; Reed, Stanley A. (1954). "The Crystal Structure of MnF ₂, FeF ₂, CoF ₂, NiF ₂ and ZnF ₂". J. Am. Chem. Soc . 76 (21): 5279?5281. doi : 10.1021/ja01650a005 .
^ Srivastava, O. K.; Secco, E. A. (1967). "Studies on Metal Hydroxy Compounds. I. Thermal Analyses of Zinc Derivatives ε-Zn(OH) ₂, Zn ₅(OH) ₈Cl ₂ · H ₂O, β-ZnOHCl, and ZnOHF" . Canadian Journal of Chemistry . 45 (6): 579?583. doi : 10.1139/v67-096 .
^ Lindahl, Charles B.; Mahmood, Tariq (2000), "Fluorine compounds, inorganic, zinc", Kirk-Othmer Encyclopedia of Chemical Technology , New York: John Wiley, doi : 10.1002/0471238961.2609140312091404.a01 , ISBN 9780471238966

External links [ edit ]

"Zinc Fluoride" . American Elements .

[1] "ZINC fluoride" . pubchem.ncbi.nlm.nih.gov .

[2] Perry, D. L.; Phillips, S. L. (1995). Handbook of Inorganic Compounds . CRC Press. ISBN 0-8493-8671-3 .

[Greenwood-3] Greenwood, Norman N. ; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann . ISBN 978-0-08-037941-8 .

[4] Stout, J. W.; Reed, Stanley A. (1954). "The Crystal Structure of MnF ₂, FeF ₂, CoF ₂, NiF ₂ and ZnF ₂". J. Am. Chem. Soc . 76 (21): 5279?5281. doi : 10.1021/ja01650a005 .

[5] Srivastava, O. K.; Secco, E. A. (1967). "Studies on Metal Hydroxy Compounds. I. Thermal Analyses of Zinc Derivatives ε-Zn(OH) ₂, Zn ₅(OH) ₈Cl ₂ · H ₂O, β-ZnOHCl, and ZnOHF" . Canadian Journal of Chemistry . 45 (6): 579?583. doi : 10.1139/v67-096 .

[6] Lindahl, Charles B.; Mahmood, Tariq (2000), "Fluorine compounds, inorganic, zinc", Kirk-Othmer Encyclopedia of Chemical Technology , New York: John Wiley, doi : 10.1002/0471238961.2609140312091404.a01 , ISBN 9780471238966

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