Tetramethylammonium pentafluoroxenate

Tetramethylammonium pentafluoroxenate is a chemical compound with the chemical formula [N(CH₃)₄]⁺[XeF₅]⁻. This salt consists of tetramethylammonium cations [N(CH₃)₄]⁺ and pentafluoroxenate(IV) anions [XeF₅]⁻. The [XeF₅]⁻ ion was the first example of a pentagonal planar molecular geometry AX₅E₂ species.^[1] 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.^[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 show that these contain the same planar ion.^[1] The isolated anion has the point group of D_5h.^[1]

Tetramethylammonium pentafluoroxenate

Names
IUPAC name N,N,N-Trimethylmethanaminium pentafluoridoxenonate(−)
Other names Tetramethylammonium pentafluoroxenate(IV)
Identifiers
CAS Number	133042-40-7
3D model (JSmol)	Interactive image
ChemSpider	21781745
InChI InChI=1S/C4H12N.F5Xe/c1-5(2,3)4;1-6(2,3,4)5/h1-4H3;/q+1;-1 Key: DNTNABLTOUYNBO-UHFFFAOYSA-N
SMILES C[N+](C)(C)C.F[Xe-](F)(F)(F)F
Properties
Chemical formula	[N(CH3)4][XeF5]
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). Y verify (what is YN ?) Infobox references