Xenon oxygen compounds

Xenate solutions may also be oxidized directly to perxenate with ozone. Solid perxenates are rather insoluble and are unusually stable for xenon-oxygen compounds Most do not decompose until healed above 200 eC. X-ray crystallographic structures have been determined for several perxenates. and they have been found to contain the octahedral XeC ion. which persists in aqueous solution (possibly with proionation to HXeOj"). 

The xenon-oxygen compounds arc extremely powerful oxidizing agents in acid solution as shown by the following EP values ... 

All xenon-oxygen compounds are very strongly oxidising, and some decompose explosively. Compounds with Xe O bonds attaching polyatomic groups are known, and weak Xe N and Xe C bonds can also be formed, as in Xe(CF3)2, which decomposes rapidly at room temperature. 

All xenon-oxygen compounds are very strongly oxidizing and thermodynamically unstable some such as Xe03 are dangerously explosive. 

Xenon-Oxygen Compounds. Both XeF4 and XeF6 are violently hydrolyzed by water to give XeVI, evidently in the form of undissociated Xe03 ... 

Tetrahydrofurans 79Eli Xenon oxygen compounds 65Sha, 89San... 

Following Bartlett s discovery of xenon hexafluoroplatinate(VI), xenon and fluorine were found to combine to give several volatile, essentially covalent fluorides, and at least one fluoride of krypton has been obtained. From the xenon fluorides, compounds containing xenon-oxygen bonds have been made much of the known chemistry of xenon is set out in Figure 12.1. 

In the past 40 years, compounds have been isolated in which xenon is bonded to several nonmetals (N, C, and Cl) in addition to fluorine and oxygen. In the year 2000, it was reported [Science, Volume 290. page 117) that a compound had been isolated in which a metal atom was bonded to xenon. This compound is a dark red solid stable at temperatures below -40°C it is believed to contain the [AuXe4F+ cation. 

Interaction of the yellow hexafluoride with silica to give xenon tetrafluoride oxide must be interrupted before completion (disappearance of colour) to avoid the possibility of formation and detonation of xenon trioxide [1]. An attempt to collect the hexafluoride in fused silica traps at — 20°C after separation by preparative gas chromatography failed because of reaction with the silica and subsequent explosion of the oxygen compounds of xenon so produced [2],... 

Since Bartlett s discovery, many other noble gas compounds have been made. All involve very electronegative elements. Most are compounds of Xe, and the best characterized compounds are xenon fluorides. Oxygen compounds are also well known. Reaction of Xe with F2, an extremely strong oxidizing agent, in different stoichiometric ratios produces xenon difluoride, Xep2 xenon tetrafluoride, XeF and xenon hexafluoride, XeFg, all colorless crystals (Table 24-3). 

The elements have a full outer electron shell (containing two electrons for helium, and eight for the others), and they do not easily form chemical compounds. The noble gases were previously referred to as the inert gases . However, the heavier atoms, lower down in the series, are a little more reactive, and xenon forms compounds with fluorine and oxygen. 

In 1979, Lagow and co-workers reported the first evidence for a compound with a bond between xenon and carbon, namely Xe(CF3)2 (90). While the evidence for this compound still receives much scrutiny, the groups of Frohn and Naumann independently synthesized the first definitive examples of compounds with a xenon-carbon bond (91-96). Until recently all of the examples of xenon-carbon bonds were cationic species. However, earlier this year Frohn reported the preparation, characterization, and structure of C6F5Xe02CC6F5, the first truly covalent compound with not only a xenon-carbon bond, but a xenon-oxygen bond as well (97). 

Separation of Some Xenon and Iodine Oxygen Compounds. Radlokhimlya 7, 678 (1965). (In Russian). 20 40851... 

Argon is two and one half times as soluble in water as nitrogen, having about the same solubility as oxygen. Argon is colorless and odorless, both as a gas and liquid. Argon is considered to be a very inert gas and is not known to form true chemical compounds, as do krypton, xenon, and radon. 

Table 18.2 Some compounds of xenon with fluorine and oxygen...

The higher fluorides are prepared using excess fluorine (Figure A). All these compounds are stable in dry air at room temperature. However, they react with water te form compounds in which one or more of the fluorine atoms has been replaced by oxygen. Thus xenon hexafluoride reacts rapidly with water to give the trioxide... 

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