Iridium hexafluoride

The compounds containing the hexahalogen complexes [IrCle], [IrBrs] with Ir(lV) formal oxidation state and iridium hexafluoride with hexavalent... 

Dining the reduction of iridium hexafluoride, osmium hexafluoride or rhenium hexafluoride with silicon to the pentafluorides, the hexafluorides must not be condensed directly onto undiluted silicon powder, or explosions may result [1]. The same is true for molybdenum hexafluoride and uranium hexafluoride [2],... 

Dibromogermane, 0267 Germanium tetrachloride, 4162 Gold(III) chloride, 0111 Indium bromide, 0289 Iridium hexafluoride, 4362 Iron(II) bromide, 0266 Iron(III) bromide, 0286 Iron(II) chloride, 4061 Iron(III) chloride, 4133 Iron(II) iodide, 4395... 

Reaction with iridium hexafluoride forms trifluoroamine oxide, NF3O, and nitrosyl iridium hexafluoride, NOIrFe ... 

Iodyltoluene, 2750 2-Iodylvinyl chloride, 0688 Iridium hexafluoride, 4356 Iridium, 4638 Iridium(IV) oxide, 4639 Iron carbide, 0364 Iron(II) bromide, 0265... 

Iodine dioxide trifluoride, 4328 Iodine(V) oxide, 4622 Iodine(VII) oxide, 4623 Iridium hexafluoride, 4356 Lead chromate, 4237 Lead(II) nitrate, 4744 Lead(II) oxide, 4818 Lead(IV) oxide, 4828 Lithium chlorite, 4014 Magnesium nitrate, 4688 Magnesium nitrite, 4687 Magnesium permanganate, 4686... 

ONF3 is also accessible from the reaction of nitrosyl fluoride with iridium hexafluoride ... 

Ruff and Fischer " 3 6 made three very rough direct determinations of the heat of formation of iridium hexafluoride, giving values of A/i (IrF6 1) of -100, -140, and -150 kcal. They adopted an approximate mean value of 130 kcal, from which (Ir-F)=67 kcal, according to Long3i7j corrected to our value of the heat of atomization of fluorine. The value for the heat of atomization of iridium is itself doubtful, so that this estimate of E lr F) is wildly approximate. 

Syathesis of Perfluoro Aromatic Radical Cation Salts. Hexafluoro-benzeae Hexafluoroiridate(V). Hexafluorobenzene (2.6 mmol) was dissolved in tungsten hexafluoride (2 mL) in a fused silica reactor to give a yellow-green solution. Iridium hexafluoride (2 mmol) was condensed into the reactor at 77 K. At about 273 K, the reaction mixture melted, and a bright orange solid rose to the surface of the WFg. The solvent and excess CgF were removed under vacuum at 298 K. The dry orange solid decomposed rapidly, producing volatile carbon fluorides. Some of the iridium was reduced to the metal. 

Iridium hexafluoride also proved able to oxidize CI2 The molar combining ratio is closer to 1 1 and, as in the case of PtFg, no evidence has been found for free chlorine fluorides in the product. Unfortunately the product is amorphous to X-rays the yellow solid is unstable at room temperature and decomposes ts. 231 to iridium pentafluoride [Z ] and a gaseous decomposition product, other than chlorine, that has not been identified. Should the Raman and infrared studies presently being carried out prove the presence of ClJlIrFe] in the adduct then it would follow that (irFi) > —144 kcahmole . ... 

Iridium hexafluoride like PtF, is a sufficiently powerful oxidizer to liberate fluorine in the mildly exothermic 1 1 reaction at 20°, the sole solid product being the salt NO+[IrF,] . These reactions are of special interest as being chemical preparations for fluorine which can be carried out at room temperature, using reactants which can be preserved indefinitely at normal temperatures and pressures. Since the enthalpy of dissociation of ONF(g) -y ON(g) -F F(g) has been given as -F55 kcal. mole t, AH for the process ONF(g) -y + I (g) + is 268 kcal. mole-. A minimum electron affinity of MF, for an exothermic reaction ONF -F IrF, -> ON+[IrF,] -F F would therefore be —143 kcal. mole, although for the liberation of molecular fluorine this would be reduced to —125 kcal. mole . The efficient formation of ONF, when an excess of nitrosyl fluoride is employed, suggests the interaction of the excess of ONF with a reaction intermediate such as ONIrF,. Presumably this intermediate does not dissociate to form atomic fluorine it is... 

Iridium hexafluoride oxidizes ReF (via an ReFg salt) and at room temperatures IrFg, ReFg, ReFy and (irFj) are each present in the equilibrium mixture. From these and related findings AH (ReFg + + e")= 1092 27 kj mole (261 6... 

Iridium hexafluoride was made by burning Ir metal (Engle-hardt) in excess F2, as in the ReF-7 preparation. Excess F2 was removed under vacuum with the product at -196°, then the IrFg was vacuum sublimed to a Monel can provided with a Swagelock KS4 valve for storage. Infrared spectrocopy [26] was employed to monitor its purity. 

The spontaneous Raman spectra of spherical top molecules of the type XF were recorded by Claasen et al. [248] and Bos worth et al. [249]. Medium-resolution spectra of sulfur hexafluoride [250-252], uranium hexafluoride [252], and iridium hexafluoride [253] were studied in more detail. Recently, Rotger et al. [254] reexamined the spontaneous Raman spectra of M0F6, WFg (see Fig. 26), ReFg, OsFg, IrF, and IF7. The Q branch of the P] band of SFe was resolved by Raman gain spectroscopy [45,255]. 

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