Tetramethylammonium pentafluoroxenate

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Tetramethylammonium pentafluoroxenate
IUPAC name
Tetramethylammonium pentafluoridoxenonate(−)
Molar mass 300.4308 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Tetramethylammonium pentafluoroxenate is the chemical compound with the formula N(CH3)4XeF5. The XeF
ion it contains was the first example of a planar pentagonal AX5E2 species.[1] It was prepared by the reaction of N(CH3)4F with xenon tetrafluoride, N(CH3)4F being chosen because it can be prepared in anhydrous form and is readily soluble in organic solvents.[1] 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°).[1] Other salts have been prepared with sodium, caesium and rubidium, and vibrational spectra shows that these contain the same planar ion.[1] The isolated anion has the unusual point group of D5d.

Ball-and-stick model of the pentafluoroxenate ion Structural formula of the pentafluoroxenate ion


  1. ^ a b c d Christe K. O., Curtis E. C., Dixon D. A., Mercier H. P.,. Sanders J. C. P, Schrobilgen G. J. (1991). "The pentafluoroxenate(IV) anion, XeF5: the first example of a pentagonal planar AX5 species". J. Am. Chem. Soc. 113 (9): 3351–3361. doi:10.1021/ja00009a021.