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Tetramethylammonium pentafluoroxenate
Names
IUPAC name
Tetramethylammonium pentafluoridoxenonate(−)
Other names
Tetramethylammonium pentafluoroxenate(IV)
Tetramethylammonium pentafluoroxenate is a chemical compound with the chemical formula [N(CH3)4][XeF5]. This salt consists of tetramethylammoniumcations [N(CH3)4] and pentafluoroxenate(IV) anions [XeF5]. The [XeF5] ion was the first example of a pentagonal planar molecular geometryAX5E2 species. It was prepared by the reaction of [N(CH3)4]F with xenon tetrafluoride, [N(CH3)4]F 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, caesium and rubidium, and vibrational spectra show that these contain the same planar ion. The isolated anion has the point group of D5h.
References
^ Christe, K. O.; Curtis, E. C.; Dixon, D. A.; Mercier, H. P.; Sanders, J. C. P.; Schrobilgen, G. J. (1991). "The pentafluoroxenate(IV) anion, XeF 5: the first example of a pentagonal planar AX5 species". Journal of the American Chemical Society. 113 (9): 3351–3361. doi:10.1021/ja00009a021.
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