Xenon oxide

Halides. Xenon duorides, xenon oxide tetraduoride [13774-85-1XeOE, and their complexes are the only thermodynamically stable xenon compounds. Xenon diduo ride [13709-36-9] xenon tetraduoride [13709-61-0], and xenon hexaduoride [13693-09-9] are colodess, crystalline soHds which can be sublimed under vacuum at 25°C. The mean thermochemical bond energies are XeE2, 132.3 0.7 kJ/mol (31.6 0.2 kcal/mol) XeE ... 

Il is an instructive exercise lo devise similar ralionalizalions for Ihe xenon oxides and oxofiuorides listed in Table 18.1. 

The xenon fluorides are used to prepare the xenon oxides and oxoacids and, in a series of disproportionations, to bring the oxidation number of xenon up to +8. First, xenon tetrafluoride is hydrolyzed to xenon trioxide, Xe03 in a disproportionation reaction ... 

Moisture converts it to highly shock-sensitive xenon oxides [1], Precautions necessary for various aspects of its use and application are detailed [2,1,1,5],... 

Although uncontrolled reaction of xenon hexafluoride and moisture produces explosive xenon trioxide, controlled action by progressive addition of limited amounts of water vapour with agitation to a frozen solution of the hexafluoride in anhydrous hydrogen fluoride at —196° C to give xenon oxide tetrafluoride or xenon dioxide difluoride is safe [1], Controlled hydrolysis in solution in hydrogen fluoride is, however, described as hazardous [2],... 

Xenon is currently exciting to scientists because, contrary to earlier belief, it has now been learned that it is not completely inert. Under the right conditions, xenon can be made to react with fluorine. It makes several different fluoride compounds, and these in turn react with oxygen to make xenon oxides. Such compounds are not used for much as yet, but the very fact of their being possible has reminded chemists that no scientific ques-... 

Xenon fluorides, 77 323-325 binary, 77 335-336 Xenon-gold cations, 77 332 Xenon halides, 77 323-325 Xenon hexafluoride, 7 7 325, 329 uses for, 7 7 336 Xenon ion lasers, 74 685 Xenon isotopes, in fission reactors, 77 375 Xenon oxide difiuoride, 77 326 Xenon oxide fluorides, 7 7 326 Xenon oxides, 77 325-326 Xenon oxide tetrafluoride, 77 326 Xenon testing, in plastics weathering, 79 584-585... 

Xenon Oxide Difluoride. XeOF2 mw 185.20 bright yel solid mp —25° to —15° (decompn occurs on slow warming, warming at > 20°/hr leads to expin). Prepn is by co-condensation of w and Xe tetrafluoride under vac at —196°, wanning to —80° and then to —63° for 2 hrs, and finally to -47° for 1 hr. The compd explds in contact with Sb pentafluoride or As pentafluoride at —196°, also when in contact with solid Hg... 

Of all the noble gases only xenon has, so far, been shown to yield oxide fluorides. The best known of these, xenon oxide tetrafluoride, was first prepared in 1963. Xe02F2 and XeOF2 are also well characterized and the compounds, XeOjF and Xe02F4 have also been synthesized. The chemistry of these up to 1972-1973 has been authoritatively reviewed (317). 

Xenon oxides are prepared from the fluorides. As has already been mentioned, hydrolysis of XeF4 and XeF6 leads to the formation of Xe03 by reactions that can be shown as... 

Additional acid ensures that Ag(II) remains in solution as cationic species (i.e. AgF2, which is insoluble in aHF, is not precipitated) and the xenon oxidation continues. Removal of aHF from a solution where additional fluoro acid was not provided for the neutralization of XeF2 gave a mixture of AgF2, Xe2F3AsF6 and [Ag(XeF2)2]AsF6 [39],... 

Caution. XeF is converted with moisture into highly shock-sensitive xenon oxides. Although Xep2 is relatively. safe to handle, it may be contaminated with small amounts of XeF. ° It should also he handled with caution. The purified reactants were condensed at — 196 C in a 130-mL nickel vessel. The vessel was allowed to warm up to rt, and the course of reaction was followed by observing the change in pressure. It was assumed that the reaction had reached completion when no further change in pressure was noted. The reaction products were first separated at the vacuum line by trapping at different temperatures, and by GC. 

Among xenon oxides only XeOs and Xe04 have been definitively isolated and characterized. XeO is known, as a gas-phase species, to be bound with respect to a D(0) atom but not with respect to ground-state P(0). There is no evidence for a condensed phase XeO species. Recently, however, the unique radical, HXeO, has been isolated by UV photolysis of either H20/Xe or N20/HBr/Xe solid mixtures as 7K. The compound was characterized by IR and its intrinsic stability supported by ab initio calculations. ... 

Xenon tetrafluoride forms stable colorless crystals. Two other xenon fluorides, XeF2 and XeFs, were synthesized by the group at Argonne, and a highly explosive xenon oxide (XeOy) was also found. The xenon fluorides react with water to form hydrogen fluoride and oxycompounds. For example ... 

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