Английская Википедия:Iridium hexafluoride
Iridium hexafluoride, also iridium(VI) fluoride, (IrF6) is a compound of iridium and fluorine and one of the seventeen known binary hexafluorides. It is one of only a few compounds with iridium in the oxidation state +6.
Synthesis
Iridium hexafluoride is made by a direct reaction of iridium metal in an excess of elemental fluorine gas at 300 °C. However, it is thermally unstable and must be frozen out of the gaseous reaction mixture to avoid dissociation.
Description
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 is orthorhombic space group Pnma. Lattice parameters are a = 9.411 Å, b = 8.547 Å, and c = 4.952 Å. There are four formula units (in this case, discrete molecules) per unit cell, giving a density of 5.11 g·cm−3.[2]
The IrF6 molecule itself (the form important for the liquid or gas phase) has octahedral molecular geometry, which has point group (Oh). The Ir–F bond length is 1.833 Å.[2]
Calculations suggest that fluorine might react with iridium hexafluoride at 39 GPa to form IrF8.[3]
References
- ↑ CRC Handbook of Chemistry and Physics, 90th Edition, CRC Press, Boca Raton, Florida, 2009, Шаблон:ISBN, Section 4, Physical Constants of Inorganic Compounds, p. 4-85.
- ↑ 2,0 2,1 T. Drews, J. Supeł, A. Hagenbach, K. Seppelt: "Solid State Molecular Structures of Transition Metal Hexafluorides", in: Inorganic Chemistry, 2006, 45 (9), S. 3782–3788; Шаблон:Doi; Шаблон:PMID.
- ↑ Шаблон:Cite journal
Further reading
- Gmelins Handbuch der anorganischen Chemie, System Nr. 67, Iridium, Supplement Volume 2, pp. 99–102.
External links
Шаблон:Hexafluorides Шаблон:Iridium compounds Шаблон:Fluorine compounds
