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Tetramethylammonium pentafluoroxenate is the chemical compound with the formula N(CH3)4XeF5. The ion it contains was the first example of a pentagonal planar molecular geometry AX5E2 species. It was prepared by the reaction of N(CH3)4F with 
xenon tetrafluoride
Xenon tetrafluoride is a chemical compound with chemical formula . It was the first discovered binary compound of a noble gas. It is produced by the chemical reaction of xenon with fluorine:
: Xe + 2 →
This reaction is exothermic, rele ...
, N(CH3)4F being chosen because it can be prepared in anhydrous form and is readily soluble in organic solvents. The anion is planar, with the fluorine atoms in a slightly distorted pentagonal coordination (Xe–F bond lengths 197.9–203.4 pm, and F–X–F bond angles 71.5°–72.3°). Other salts have been prepared with sodium, cesium and rubidium, and vibrational spectra show that these contain the same planar ion. The isolated anion has the point group
In geometry, a point group is a mathematical group of symmetry operations (isometries in a Euclidean space) that have a fixed point in common. The coordinate origin of the Euclidean space is conventionally taken to be a fixed point, and every p ...
of ''D''5h.
References
{{Noble gas compounds Fluoro complexes Xenon(IV) compounds Tetramethylammonium salts