Xenon dioxide

Xenon dioxide

Names
IUPAC name xenon dioxide
Identifiers
3D model (JSmol)	Interactive image
ChemSpider	26667799
InChI InChI=1S/O2Xe/c1-3-2 Key: BMYPQOLESFVQPA-UHFFFAOYSA-N
SMILES O=[Xe]=O
Properties
Chemical formula	XeO2
Molar mass	163.29 g/mol
Appearance	yellow solid[1]
Structure
Molecular shape	Bent
Related compounds
Related compounds	Xenon trioxide Xenon tetroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Xenon dioxide, or xenon(IV) oxide, is a compound of xenon and oxygen with formula XeO₂ which was synthesized in 2011. It is synthesized at 0 °C by hydrolysis of xenon tetrafluoride in aqueous sulfuric acid:^[2]

$${\displaystyle {\ce {XeF4 + 2H2O -> XeO2 + 4HF}}}$$

Structure

XeO
₂ has an extended (chain or network) structure in which xenon and oxygen have coordination numbers of four and two respectively. The geometry at xenon is square planar, consistent with VSEPR theory for four ligands and two lone pairs (or AX₄E₂ in the notation of VSEPR theory).

In addition, the existence of an XeO₂ molecule was predicted by an ab initio quantum chemistry method several years earlier by Pyykkö and Tamm, but these authors did not consider an extended structure.^[3]

Properties

XeO
₂ is a yellow-orange solid.^[4] It is an unstable compound, with a half-life of about two minutes, disproportionating into XeO
₃ and xenon gas. Its structure and identity was confirmed by cooling it to −150 °C so that Raman spectroscopy could be performed before it decomposed.^[2][1]

At -78 °C, the majority of XeO₂ decomposed over a period of 72 hours, which was identified by the fading of the original yellow product to a pale yellow. Almost all yellow color indicating pure XeO₂ disappeared over the span of 1 week.^[2]

3 XeO₂ → Xe + 2 XeO₃

References