Hafnium Tetrafluoride

Hafnium(IV) fluoride
Names
	IUPAC names Hafnium(IV) fluoride; Hafnium tetrafluoride
Identifiers
CAS Number	13709-52-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	3306631 ;
EC Number	237-258-0;
PubChem CID	50925283;
	InChI InChI=1S/4FH.Hf/h4*1H;/q;;;;+4/p-4 Key: QHEDSQMUHIMDOL-UHFFFAOYSA-J;
	SMILES [F-].[F-].[F-].[F-].[Hf+4];
Properties
Chemical formula	HfF4
Appearance	white crystalline powder
Density	7.1 g/cm3
Boiling point	970 °C (1,780 °F; 1,240 K) (sublimes)
Structure
Crystal structure	Monoclinic, mS60
Space group	C2/c, No. 15
Lattice constant	a = 1.17 nm, b = 0.986 nm, c = 0.764 nm
Hazards
Flash point	Non-flammable
Related compounds
Other anions	Hafnium(IV) chloride
Other cations	Titanium(IV) 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

Hafnium tetrafluoride is the inorganic compound with the formula HfF₄. It is a white solid. It adopts the same structure as zirconium tetrafluoride, with 8-coordinate Hf(IV) centers.

Hafnium tetrafluoride forms a trihydrate, which has a polymeric structure consisting of octahedral Hf center, described as (μ–F)
2[HfF
2(H
20)
2]_n(H₂O)_n and one water of crystallization. In a rare case where the chemistry of Hf and Zr differ, the trihydrate of zirconium(IV) fluoride has a molecular structure (μ–F)
2[ZrF
3(H
20)
3]
2, without the lattice water.^[3]

References

↑ ^1.0 ^1.1 Haynes, William M., ed (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.66. ISBN 1439855110.
↑ Zachariasen, W. H. (1949). "Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types". Acta Crystallographica 2 (6): 388–390. doi:10.1107/S0365110X49001016.
↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 965. ISBN 978-0-08-037941-8.

v t e Hafnium compounds
Hf(II)	HfB₂
Hf(IV)	HfC HfBr₄ HfCl₄ HfF₄ HfI₄ Hf(C₅H₇O₂)₄ HfO₂ HfSiO₄ HfS₂ Ta₄HfC₅

Names

IUPAC names Hafnium(IV) fluoride Hafnium tetrafluoride
Identifiers
CAS Number	13709-52-9^Y
3D model (JSmol)	Interactive image
ChemSpider	3306631^Y
EC Number	237-258-0
PubChem CID	50925283
InChI InChI=1S/4FH.Hf/h4*1H;/q;;;;+4/p-4 Key: QHEDSQMUHIMDOL-UHFFFAOYSA-J
SMILES [F-].[F-].[F-].[F-].[Hf+4]
Properties
Chemical formula	HfF₄
Appearance	white crystalline powder
Density	7.1 g/cm³^[1]
Boiling point	970 °C (1,780 °F; 1,240 K) (sublimes)^[1]
Structure
Crystal structure	Monoclinic, mS60^[2]
Space group	C2/c, No. 15
Lattice constant	a = 1.17 nm, b = 0.986 nm, c = 0.764 nm
Hazards
Flash point	Non-flammable
Related compounds
Other anions	Hafnium(IV) chloride
Other cations	Titanium(IV) fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is ^YN ?)
Infobox references

Hafnium Tetrafluoride

References

Further reading