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Zirconium(IV) iodide

hygroscopic (triple point) | NFPA-H = 3 | NFPA-R = 2 | NFPA-F = 0 Zirconium(IV) chloride Zirconium(IV) bromide Hafnium tetraiodide

Zirconium(IV) iodide is the chemical compound with the formula ZrI4. It is the most readily available iodide of zirconium. It is an orange-coloured solid that degrades in the presence of water. The compound was once prominent as an intermediate in the purification of zirconium metal.

Structure

Like most binary metal halides, zirconium(IV) iodide adopts a polymeric structure. As characterized by X-ray crystallography, the compound consists of octahedral Zr(IV) centers interconnected by four doubly bridging iodide ligands. The Zr-I distances of 2.692 (terminal) and 3.030 Å

Synthesis and reactions

This compound can be prepared by heating zirconium metal and an excess of iodine. The solid is purified by sublimation (400 °C, 10-4 mm Hg). :

Pyrolysis of zirconium(IV) iodide gas by contact with a hot wire was the first industrial process for the commercial production of pure ductile metallic zirconium. This crystal bar process was developed by Anton Eduard van Arkel and Jan Hendrik de Boer in 1925.

Heating the tetraiodide with zirconium metal gives zirconium triiodide: :

References

References

  1. (1979). "Kristallstruktur von Zirkoniumtetrajodid ZrI4: ein neuer AB4-Strukturtyp". Acta Crystallogr..
  2. (1986). "Crystal Structure of γ-ZrI4". Kristallografiya.
  3. Eberly, K. C.. (1963). "Inorganic Syntheses".
  4. (1981). "Synthesis and Structure of an Infinite-Chain Form of ZrI2 (α)". Journal of Solid State Chemistry.
  5. (1925). "Darstellung von reinem Titanium-, Zirkonium-, Hafnium- und Thoriummetall". [[Zeitschrift für anorganische und allgemeine Chemie]].
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iodides zirconium(iv)-compounds metal-halides
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