Xenon difluoride

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Xenon difluoride is a powerful fluorinating agent with the chemical formula , and one of the most stable xenon compounds. Like most covalent inorganic fluorides it is moisture sensitive. It decomposes on contact with light or water vapour. Xenon difluoride is a dense, white crystalline solid. It has a nauseating odour but low vapor pressure. It has a strong characteristic infrared doublet at 550 cm<sup>−1</sup> and 556&nbsp;cm<sup>−1</sup>.


Xenon difluoride is a linear molecule with an Xe–F bond length of 197.73±0.15&nbsp;pm in the vapor phase, and 200&nbsp;pm in the solid phase. The packing arrangement in solid shows that the fluorine atoms of neighbouring molecules avoid the equatorial region of each molecule. This agrees with the prediction of VSEPR theory, which predicts that there are 3 pairs of non-bonding electrons around the equatorial region of the xenon atom.

At high pressures, novel, non-molecular forms of xenon difluoride can be obtained. Under a pressure of ~50&nbsp;GPa, transforms into a semiconductor consisting of units linked in a two-dimensional structure, like graphite. At even higher pressures, above 70&nbsp;GPa, it becomes metallic, forming a three-dimensional structure containing units.



Synthesis proceeds by the simple formula:

Xe + F<sub>2</sub> →......

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