Nitrosonium octafluoroxenate(VI)

Nitrosonium octafluoroxenate(VI) is a chemical compound of xenon with nitrogen, oxygen, and fluorine, having formula (NO)2XeF8.

It is an ionic compound containing well-separated nitrosonium cations (NO+) and octafluoroxenate(VI) anions (XeF2−8).

The molecular geometry of the octafluoroxenate(VI) ion is square antiprismatic, having Xe–F bond lengths of 1.971 Å, 1.946 Å, 1.958 Å, 2.052 Å, and 2.099 Å.

[1] It is synthesized by the reaction of xenon hexafluoride (XeF6) with nitrosyl fluoride (NOF):[2] Other compounds containing the octafluoroxenate(VI) ion include its alkali metal salts, including Cs2XeF8 and Rb2XeF8, which are stable up to 400 °C.

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A greenish-blue central atom surrounded by and bonded to eight yellowish-green atoms arranged in a square antiprismatic fashion.