Zirconium(IV) bromide

Zirconium(IV) bromide

Names
Other names zirconium tetrabromide
Identifiers
CAS Number	13777-25-8
3D model (Jmol)	Interactive image
ChemSpider	75549
ECHA InfoCard	100.034.002
InChI InChI=1S/4BrH.Zr/h4*1H;/q;;;;+4/p-4 Key: LSWWNKUULMMMIL-UHFFFAOYSA-J InChI=1/4BrH.Zr/h4*1H;/q;;;;+4/p-4 Key: LSWWNKUULMMMIL-XBHQNQODAM
SMILES Br[Zr](Br)(Br)Br
Properties
Chemical formula	ZrBr4
Molar mass	410.86 g/mol
Appearance	off-white powder
Density	4.201 g/cm^3, solid
Melting point	450 °C (842 °F; 723 K)
Boiling point	sublimes
Solubility in water	reacts with water
Structure
Crystal structure	Cubic, cP40
Space group	P-43m, No. 205
Hazards
EU classification (DSD)	not listed
NFPA 704	0 3 2
Related compounds
Other anions	Zirconium(IV) fluoride Zirconium(IV) chloride Zirconium(IV) iodide
Other cations	Titanium tetrabromide Hafnium tetrabromide
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

Zirconium(IV) bromide is the inorganic compound with the formula ZrBr₄. This colourless solid is the principal precursor to other Zr–Br compounds.

Preparation and properties

ZrBr₄ is prepared by the action of bromine on zirconium oxide via a carbothermic reaction:^[1]

ZrO₂ + 2 C + 2 Br₂ → ZrBr₄ + 2 CO

Like many related tetrahalides, it is purified by sublimation.

Like related tetrabromides of Ti and Hf, ZrBr₄ hydrolyzes readily to give oxy-bromide, with release of hydrogen bromide.

Structure

ZrBr₄ adopts the structure seen for the related compounds, TiCl₄ and TiBr₄, featuring tetrahedral Zr centers. In contrast, ZrCl₄ is polymeric in the solid state, featuring octahedral Zr centers.^[2]

References

1. R. C. Young, Hewitt G. Fletcher, "Anhydrous Zirconium Tetrabromide" Inorganic Syntheses, 1939, vol. 1, pp. 49–51. doi:10.1002/9780470132326.ch18
2. Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.