Zirconium(IV) bromide

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Zirconium(IV) bromide
Zirconium(IV) bromide
Identifiers
CAS number 13777-25-8 N
ChemSpider 75549 YesY
Jmol-3D images Image 1
Properties
Molecular formula ZrBr4
Molar mass 410.86 g/mol
Appearance off-white powder
Density 4.201 g/cm3, solid
Melting point 450 °C
Boiling point sublimes
Solubility in water reacts with water
Structure
Crystal structure Cubic, cP40
Space group P-43m, No. 205
Hazards
EU classification not listed
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g., phosphorus Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Other anions Zirconium(IV) fluoride
Zirconium(IV) chloride
Zirconium(IV) iodide
Other cations Titanium tetrabromide
Hafnium tetrabromide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
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[edit]

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[edit]

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[edit]

  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.