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| Names | |
|---|---|
| Other names zirconium tetraiodide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
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| ECHA InfoCard | 100.034.332 |
| EC Number |
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| UNII | |
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| Properties | |
| ZrI4 | |
| Molar mass | 598.842 g/mol |
| Appearance | orange-yellow crystalline hygroscopic |
| Density | 4.914 g/cm3 |
| Melting point | 499[1] °C (930 °F; 772 K) (triple point) |
| Boiling point | 431 °C (808 °F; 704 K) (sublimes) |
| Structure | |
| Monoclinic,mP30 | |
| P2/c, No. 13 | |
| Hazards | |
| GHS labelling: | |
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| Danger | |
| H314 | |
| P260,P264,P280,P301+P330+P331,P303+P361+P353,P304+P340,P305+P351+P338,P310,P321,P363,P405,P501 | |
| NFPA 704 (fire diamond) | |
| Related compounds | |
Otheranions | Zirconium(IV) fluoride Zirconium(IV) chloride Zirconium(IV) bromide |
Othercations | Titanium tetraiodide Hafnium tetraiodide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Zirconium(IV) iodide is thechemical compound with the formulaZrI4. 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.
Like most binary metal halides, zirconium(IV) iodide adopts a polymeric structure. As characterized byX-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[2][3]
This compound can be prepared by heating zirconium metal and an excess of iodine.[1] The solid is purified by sublimation (400 °C, 10-4 mm Hg).[4]
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. Thiscrystal bar process was developed byAnton Eduard van Arkel andJan Hendrik de Boer in 1925.[5]
Heating the tetraiodide with zirconium metal giveszirconium triiodide:[4]
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