Metal-xenon compounds

The first metal-xenon compound with direct Au—Xe bonds has been reported by Seidel and Seppelt1027-1029 [Eq. (4.252)]. The salt crystallizes in two crystallographic modifications differing in cation-anion interactions. In each form the cation is a regular square. In the triclinic modification the Au—Xe bond lengths are between 2.7330 A and 2.7779 A and there are three weak interionic contacts (Au—F... 

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Russian scientists (Avrorin et al., 1981, 1985) have reported that reactions of complex mixtures of radon, xenon, metal fluorides, bromine pentafluoride, and fluorine yield a higher fluoride of radon which hydrolyzes to form RnO. However, efforts to confirm these findings have been unsuccessful. In similar experiments which have been carried out at Argonne National Laboratory (Stein, 1984), it has been found that radon in the hydrolysate is merely trapped in undissolved solids centrifugation removes the radon from the liquid phase completely. This is in marked contrast to the behavior of a solution of XeO, which can be filtered or centrifuged without loss of the xenon compound. Hence there is no reliable evidence at present for the existence of a higher oxidation state of radon or for radon compounds or ions in aqueous solutions. Earlier reports of the preparation of oxidized radon species in aqueous solutions (Haseltine and Moser, 1967 Haseltine, 1967) have also been shown to be erroneous (Flohr and Appelman, 1968 Gusev and Kirin, 1971). 

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