Osmium hexafluoride

At room temperature, osmium hexafluoride yields a blue material of approximate composition CgOsFg (B22). Its magnetic susceptibility obeys the Curie-Weiss law, with a magnetic moment, /lefi = 3.5 BM,... 

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],... 

Manganese trichloride oxide, 4141 Manganese trifluoride, 4335 Mercury(II) bromide, 0269 Mercury(I) fluoride, 4312 Mercury(II) iodide, 4602 Molybdenum hexafluoride, 4365 Molybdenum pentachloride, 4180 Neptunium hexafluoride, 4366 Osmium hexafluoride, 4370 Palladium tetrafluoride, 4347 Palladium trifluoride, 4341... 

Nitrosyl tetrafluorochlorate, 3985 Nitrous acid, 4435 Nitryl chloride, 4025 Nitryl fluoride, 4303 Nitryl hypochlorite, 4026 Nitryl hypofluorite, 4304 Nitryl perchlorate, 4029 Osmium hexafluoride, 4370 Osmium(VIII) oxide, 4858 Oxygen (Gas), 4831 Oxygen (Liquid), 4832 Oxygen difluoride, 4317 Ozone, 4846... 

This compound is the only one known for these elements in this oxidation state it is obtained as a highly-colored solid by the high-temperature reaction between fluorine and the metal. The solid is isostructural with the hexafluorides of osmium and iridium, and the Pt-F distance has been estimated at 1 83 A by extrapolation along the series W-Os-Ir 255). The infrared spectrum has been assigned in Oh symmetry 256) there are no signs of any distortion, as found for example in osmium hexafluoride. 

Osmium hexafluoride, 4364 Palladium tetrafluoride, 4341 Palladium trifluoride, 4335... 

Nitrogen dioxide, 4720 Nitrogen oxide, 4719 Nitrosyl chloride, 4017 Nitrosyl fluoride, 4296 Nitrosyl perchlorate, 4021 Nitrosyl tetrafluorochlorate, 3979 Nitrosylsulfuric acid, 4432 Nitrous acid, 4429 Nitryl chloride, 4019 Nitryl fluoride, 4297 Nitryl hypochlorite, 4020 Nitryl hypofluorite, 4298 Nitryl perchlorate, 4023 Osmium hexafluoride, 4364 Osmium(VIII) oxide, 4852 Oxygen difluoride, 4311 Oxygen (Gas), 4825 Oxygen (Liquid), 4826 Ozone, 4840... 

The way in which the oxidizing power of the hexafluorides increases with atomic number in the third transition series is demonstrated by the nature of the reactions with nitric oxide which are summarized in Figure 7. Since the ionization potential of nitric oxide is 62 kcal. mole lower than for oxygen it can reduce osmium hexafluoride to the quinquevalent and platinum to the quadrivalent... 

Preparation of Osmium Oxide Pentafluoride.—Osmium oxide pentafluoride was made in several ways, (a) Osmium metal was heated in a stream of oxygen and fluorine (1 2 v/v). The reaction was carried out in a quartz tube with the osmium in a nickel boat, and was initiated by the heat from a small flame. Once started, the reaction sustained itself. The product, which was caught in traps at —183°, was a mixture of an emerald green solid and a pale yellow, more volatile, solid. The difference in volatility of the components of the mixture permitted their separation by trap to trap sublimation under reduced pressure, from a trap held at —16° to receivers cooled with liquid nitrogen. The emerald green solid was retained in the —16° trap. The more volatile, yellow, component proved, from its infrared spectrum, to be osmium hexafluoride. The emerald green solid, m. p. 59-2°, established by infrared spectroscopy, to be free of OsFj, amounted to —50% of the product. 

The isolation of the compounds 2XeF2-VF5 and 2XeF2-TaFs was not confirmed. Stable 2 1 compounds were not obtained either in the Xep2 -NbFs nor in the XeF2 -TaFs systems. The compound XeF2 20sFs was not prepared. Even the 1 1 compound is thermally unstable at room temperature and decomposes to 2XeF2 OsFs, xenon, and osmium hexafluoride. 

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