Xenon tetrafluoride

Xenon tetrafluoride, XeF4, is one of the chemical compounds derived from the noble gas xenon. It was the first discovered noble gas compound containing a noble gas and exactly one other element. It forms by the reaction of Xe and F2 in the ratio of 1 mol Xe to 2 mol F2. The process is exothermic, releasing 251 kJ per mol of Xe.

The structure was determined by NMR spectroscopy and x-ray crystallography in 1963. The structure is square planar. This structure is justified by VSEPR theory because xenon has two lone pairs of electrons above and below the plane of the molecule.

Xenon tetrafluoride occurs as colorless crystals. It sublimes at 115.7 °C (240.26 °F).

Xenon fluorides are all exergonic and stable at normal temperatures. They do react readily with water, even pulling water from air, so they must be kept in anhydrous conditions.


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