Xenon dioxide

Xenon dioxide
Names
	IUPAC name xenon dioxide
Identifiers
CAS Number	15792-90-2 [???];
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
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]

XeF₄ + 2H₂O → XeO₂ + 4HF

Structure

XeO₂ 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

XeO₂ is a yellow-orange solid.^[4] It is an unstable compound, with a half-life of about two minutes, disproportionating into XeO₃ 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

^ ^a ^b Tyler Irving (May 2011). "Xenon Dioxide May Solve One of Earth's Mysteries". L’Actualité chimique canadienne (Canadian Chemical News). Archived from the original on 2013-02-09. Retrieved 2012-05-18.
^ ^a ^b ^c Brock, David S.; Schrobilgen, Gary J. (2011). "Synthesis of the Missing Oxide of Xenon, XeO₂, and Its Implications for Earth's Missing Xenon". Journal of the American Chemical Society. 133 (16): 6265–6269. doi:10.1021/ja110618g. PMID 21341650.
^ Pyykkö, Pekka; Tamm, Toomas (1 April 2000). "Calculations for XeO_n(n = 2−4): Could the Xenon Dioxide Molecule Exist?". The Journal of Physical Chemistry A. 104 (16): 3826–3828. doi:10.1021/jp994038d.
^ Cotton, Simon (1 May 2011). "Xenon dioxide". Soundbite. Education in Chemistry. Vol. 48, no. 3. Royal Society of Chemistry. p. 69. Retrieved 2012-05-18.