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Chemical compound From Wikipedia, the free encyclopedia
Zirconium(III) iodide is an inorganic compound with the formula ZrI3.
Names | |
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IUPAC name
Zirconium triiodide | |
Identifiers | |
3D model (JSmol) |
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PubChem CID |
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Properties | |
I3Zr | |
Molar mass | 471.937 g·mol−1 |
Appearance | dark blue crystals[1] |
Melting point | 727 °C (1,341 °F; 1,000 K) |
Structure | |
Orthorhombic | |
Pmmn, No. 59 | |
a = 12.594 Å, b = 6.679 Å, c = 7.292 Å | |
Related compounds | |
Other anions |
Zirconium(III) chloride Zirconium(III) bromide |
Other cations |
Titanium(III) iodide Hafnium(III) iodide |
Related compounds |
Zirconium(IV) iodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Like other group 4 trihalides, zirconium(III) iodide can be prepared from zirconium(IV) iodide by high-temperature reduction with zirconium metal, although incomplete reaction and contamination of the product with excess metal often occurs.[2]
An alternative is to crystallise zirconium(III) iodide from a solution of zirconium(III) in aluminium triiodide. The solution is prepared by reducing a eutectic solution of ZrI4 in liquid AlI3 at a temperature of 280–300 °C with metallic zirconium or aluminium.[3][4]
Zirconium(III) iodide has a lower magnetic moment than is expected for the d1 metal ion Zr3+, indicating non-negligible Zr–Zr bonding.[2]
The crystal structure of zirconium(III) iodide is based on hexagonal close packing of iodide ions with one third of the octahedral interstices occupied by Zr3+ ions.[2] The structure consists of parallel chains of face-sharing {ZrI6} octahedra[5] with unequally spaced metal atoms. The Zr–Zr separation alternates between 3.17 Å and 3.51 Å.[6]
ZrCl3, ZrBr3 and ZrI3 adopt structures very similar to the β-TiCl3 structure.[2] In all three ZrX3 there is some elongation of the octahedra along the metal-metal axis, partly due to metal-metal repulsion,[4] but the elongation is most pronounced in the chloride, moderate in the bromide and negligible in the iodide.[4]
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