Halogen fluorides, reactions with radon

Krypton difluoride cannot be synthesized by the standard high pressure-high temperature means used to prepare xenon fluorides because of the low thermal stabitity of KrF. There are three low temperature methods which have proven practical for the preparation of gram and greater amounts of KrF (141—143). Radon fluoride is most conveniently prepared by reaction of radon gas with a tiquid halogen fluoride (CIE, CIE, CIE, BrE, or lE ) at room temperature (144,145). 

This was further substantiated by reactions of radon with fluoroni-trogen salts and halogen-fluoride metal salts, and the development of a method of collecting radon from air using [02]+[SbF6] or [IF6]+[SbF6] (237). 

Radon fluoride is most conveniently prepared by reaction of radon gas with a liquid halogen fluoride (CIP, CIF3, CIF5, BrPs, or IF7) at room temperature. Millicurie or larger amounts of radon react spontaneously with gaseous or liquid fluorine in a small volume (25 or 50 mL flask) within about 30 min. The radon behaves as both activator and reactant. The product is nonvolatile and hence remains in the reaction vessel when the excess reagent is removed by vacuum distillation. 

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