![]() nCrOF 4 (n = 1, 2), and have also been synthesized and structurally characterized by SCXRD and Raman spectroscopy.T he linear, centrosymmetric (D 1h )N gF 2 (Ng = Kr,X e) molecules distort upon coordination to af luoride-ion acceptor (A) to form aNg À F b -Abridge in which the Ng À F b bond is elongated and the terminal Ng À F t bond is contracted relative to free NgF 2.Thex enon analogues, Hg-(OTeF 5 ) 2 ♱.5 XeF 2, XeF 2 Most recently,the KrF 2 adducts of the weak fluoride-ion acceptor,CrOF 4 ,have been reported and structurally characterized for KrF 2 Prior studies have explored the ligating properties of KrF 2 and have provided several KrF 2 adducts that were structurally characterized by low-temperature (LT) single-crystal X-ray diffraction (SCXRD) and Raman spectroscopy.T he latter include complexes with amain-group Br V oxyfluoride cation,, an eutral covalent transition-metal Hg II compound, Hg(OTe F 5 ) 2 ♱.5KrF 2, at ransition-metal cation, Hg 2+, 2, and amain-group metal cation, Mg 2+. Although the discoveries of xenon and krypton chemical reactivities occurred nearly 60 years ago and within ay ear of one another, their chemistries never became entwined to form as ingle compound that contains both chemically bound noble gases.Inc ontrast with xenon, which exhibits formal oxidation states in its isolated compounds of 0, + 1 = 2, + 2, + 4, + 6, and + 8, krypton only exhibits the + 2 oxidation state and af ar more limited chemistry.T he only binary krypton fluoride that can be synthesized in macroscopic and synthetically useful amounts is KrF 2, from which all other krypton compounds have been derived. Although the precise formulation of Xe remains unproven, it is likely as alt or am ixture of + salts. ![]() Krypton reactivity was discovered soon after the landmark synthesis of the first true noble-gas compound, Xe.
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