Nickel hexafluoride

Keywords Anhydrous hydrogen fluoride Nickel hexafluoride salts Silver tetrafluoride salts Oxidizing power Reactivity... 

Tungsten hexafluoride is shipped as a Hquid under its own vapor pressure in nickel or steel cylinders in quantities of 45 kilograms per cylinder or less however, it has been shown that the purity of WF packaged in steel cylinders can degrade over time (21). It is classified as a corrosive Hquid by the... 

Platinum hexafluoride may be prepared by heating platinum with fluorine under pressure. The preparation should be in nickel or Monel apparatus as the compound reacts with glass. 

Sulfur hexafluoride is formed in 97 % yield by electrochemical perfluorination of hydrogen sulfide (in anhyd HF with l-2wt% KHF2 nickel anodes iron cathodes voltage 7 V).45... 

The electrochemical perfluorination of propane-2-thiol46 gives pcntafluoro(heptafluoro-propan-2-yl)-/.6-sulfane (yield 1.7%), fragmented fluorocarbons (main product octafluoro-propane, 48.6%) and sulfur hexafluoride (38.9%) (electrolyte anhyd HF effective surface area of nickel anodes 770 cm2 voltage 4.7-6.1 V current density 2.6 A dm 2 temperature 8 10 C). 

Sulfur tetrafluoride is thermally stable up to 600 °C. Within the temperature range 600-1000 C, less than 1 % undergoes disproportionation to sulfur hexafluoride and sulfur.24 Most of the common construction metals, such as copper, nickel and steel, are resistant to sulfur tetrafluoride. Mercury also does not react with sulfur tetrafluoride.3 The recommended construction material for work with sulfur tetrafluoride is Hastelloy or stainless steel and, at low pressure,... 

Neodymium perchlorate. 2acetonitrile, 4142 f Neopentane, see 2,2-Dimethylpropane, 1993 f Neopentylamine, see 2,2-Dimethylpropylamine, 2024 Neptunium hexafluoride, 4360 Nickel azide, All 1 Nickel chlorite, 4087... 

Raney cobalt alloy, see Aluminium—cobalt alloy, 0049 Raney nickel alloys, see Aluminium—nickel alloys, 0055 Resorcinol diacetate, see 1,3-Diacetoxybenzene, 3285 Resorcinol, see 1,3-Benzenediol, 2325 Rhenium hexafluoride, 4367 Rhenium hexamethoxide, 2599 Rhenium nitride tetrafluoride, 4338 Rhenium, 4884... 

Manganese fluoride trioxide, 4295 Manganese tetrafluoride, 4337 Manganese(IV) oxide, 4700 Manganese(VII) oxide, 4704 Mercury(II) bromate, 0269 Mercury(II) nitrate, 4598 Mercury(II) oxide, 4600 Monofluoroxonium hexafluoroarsenate, 0097 Neptunium hexafluoride, 4360 Nickel(II) nitrate, 3583... 

Uranium can be analysed as the hexafluoride, but the procedure requires modification of the chromatographic apparatus, nickel coating of metallic parts and nickel filaments in the katharometer [606], Tin in zirconium—tin alloys can be analysed as the chloride, prepared by treatment with chlorine [607]. Selenium and tellurium are converted into fluorides by treatment of their oxides with xenon difluoride [608]. 

Nickel, monel, aluminum, copper, stainless steel and carbon steel are suitable metals for handling tungsten hexafluoride. Nickel and monel are more suitable at high temperatures of 100 -400 C. Packing and gasketing can be made of polytetrafluoroethylene (PTFE). System components should be thoroughly clean and dry before use. 

Containment of Materials. All experimental work with hexafluorides was carried out in a metal manifold constructed of nickel tubing and fittings which could be evacuated by both mechanical and diffusion pumps. The manifold incorporated Monel diaphragm valves and a number of 1 in. diameter valves with brass bodies. Monel bellows, and Teflon seats. The hexafluorides were transferred between vessels in the manifold by vacuum distillation at room temperature. 

Sample tubes containing the hexafluoride mixtures were positioned in cavities of a cylindrical nickel block. The temperature of the block... 

Mixtures of MoFe and UFe were prepared for x-ray diffraction analysis as follows. A sample of MoFe was measured by a PVT method and condensed into a nickel tube where it was isolated by a valve. A UFe sample was measured similarly and subsequently condensed into the nickel tube. The MoFe and UFe samples were then allowed to vaporize so that they fllled the volumes of both a ballast tank and the nickel tube. The MoFe-UFe vapors remained in this volume to mix at ambient temperature for 15 to 48 hours. A small sample of the hexafluoride mixture was trapped in the capillary tube, condensed into the tip, and the capillary was sealed off as described above. 

Prior to the first report of platinum hexafluoride had observed that when platinum or platinum salts were fluorinated in silica apparatus a deep red solid was produced. This solid sublimed in a good vacuum, below 100. It was evidently an oxyfluoride, the oxygen being derived from interaction of fluorine with the siUca SiOg -f- 2Fg —> SiF + Og, since fluorination of platinum in nickel apparatus did not give it. 

Table 8. — Xenon — rhodium hexafluoride RhFs (solid + gas) -F Xe (gas) in a nickel weighing can...

Nitric oxide is readily oxidized by platinum hexafluoride but it has not proved possible to control the reaction to produce a pure product. A mixture of NOPtF, and (NO)jPtF, is always produced. Platinum hexafluoride is, however, able to oxidize nitrosyl fluoride with the elimination of fluorine ONF - - PtF, - ON+[PtF8J - -iFj. In a typical experiment, platinum hexafluoride (5-20 mmoles), prepared by Weinstock, Malm, and Weaver s method, was warmed to room temperature, in a closed nickel vessel, with... 

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. 

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