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Hafnium tetrafluoride

Hafnium(IV) fluoride
Zirconium(IV) fluoride
Names
IUPAC names
Hafnium(IV) fluoride
Hafnium tetrafluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.856 Edit this at Wikidata
EC Number
  • 237-258-0
  • InChI=1S/4FH.Hf/h4*1H;/q;;;;+4/p-4
    Key: QHEDSQMUHIMDOL-UHFFFAOYSA-J
  • [F-].[F-].[F-].[F-].[Hf+4]
Properties
HfF4
Appearance white crystalline powder
Density 7.1 g/cm3[1]
Boiling point 970 °C (1,780 °F; 1,240 K) (sublimes)[1]
Structure
Monoclinic, mS60[2]
C2/c, No. 15
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).
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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[HfF2(H20)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[ZrF3(H20)3]2, without the lattice water.[3]

References

  1. ^ a b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.66. ISBN 1-4398-5511-0.
  2. ^ 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.
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 965. ISBN 978-0-08-037941-8.

Further reading

  • Benjamin, S. L., Levason, W., Pugh, D., Reid, G., Zhang, W., "Preparation and structures of coordination complexes of the very hard Lewis acids ZrF4 and HfF4", Dalton Transactions 2012, 41, 12548. doi:10.1039/C2DT31501G
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