-fluoride.svg) | |
| Names | |
|---|---|
| IUPAC name iridium(VI) fluoride | |
| Other names iridium hexafluoride | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.029.113 |
| UNII | |
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| |
| Properties | |
| IrF6 | |
| Molar mass | 306.22 g/mol |
| Appearance | yellow crystalline solid[1] |
| Density | 5.11g/mL[2] |
| Melting point | 44 °C (111 °F; 317 K)[1] |
| Boiling point | 53.6 °C (128.5 °F; 326.8 K)[1] |
| Solubility | soluble inHF |
| Related compounds | |
Othercations | rhodium hexafluoride osmium hexafluoride platinum hexafluoride |
Related compounds | iridium(V) fluoride |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Iridium hexafluoride, alsoiridium(VI) fluoride, (IrF6) is a compound ofiridium andfluorine and one of the seventeen known binaryhexafluorides. It is one of only a few compounds with iridium in theoxidation state +6.
Iridium hexafluoride is made by a direct reaction of iridium metal in an excess of elementalfluorine gas at 300 °C. However, it is thermally unstable and must be frozen out of the gaseous reaction mixture to avoid dissociation.
Iridium hexafluoride is a yellow crystalline solid that melts at 44 °C and boils at 53.6 °C.[1] The solid structure measured at −140 °C isorthorhombic space groupPnma.Lattice parameters area = 9.411 Å,b = 8.547 Å, andc = 4.952 Å. There are fourformula units (in this case, discrete molecules) perunit cell, giving a density of 5.11 g·cm−3.[2]
The IrF6 molecule itself (the form important for the liquid or gas phase) hasoctahedral molecular geometry, which has point group (Oh). The Ir–Fbond length is 1.833 Å.[2]
Calculations suggest thatfluorine might react with iridium hexafluoride at 39 GPa to form IrF8.[3]
