Mixed cation [H₃O]⁺/[XeF₅]⁺/M²⁺ (M=Ca, Cd), [O₂]⁺/[XeF₅]⁺/Sr²⁺ and [H₃O]⁺/Sr²⁺ fluoridoantimonate(V) salts

Abstract

The reaction between H3OSbF6, XeF5SbF6, and M(SbF6)2 (M=Ca, Cd) in anhydrous HF gave (H3O)(XeF5)2M2(SbF6)7 ⋅ nHF salts (n=3.95 for M=Ca and n=3.21 for M=Cd) upon crystallization. Their crystal structures consist of SbF6 units connecting M2+ centers located in the same plane. In this way, slabs are formed, each slab containing a layer of M2+ cations. The [XeF5]+ and [H3O]+ cations are located between adjacent slabs. Single crystals of (O2)(XeF5)2Sr4(SbF6)11 ⋅ 8HF were grown from aHF solution prepared by reaction between O2SbF6, XeF2, SrF2, SbF3 and UV‐irradiated F2. Attempts to grow single crystals of the fluoridoantimonate(V) salt containing simultaneously the cation [H3O]+ and XeF2 coordinated to an M2+ metal center failed. Instead, only a few single crystals of the H3O[Sr(HF)2]3(SbF6)6(Sb2F11) salt were observed. An attempt to grow single crystals of NH4XeF5MnF6 from aHF solution yielded only a mixture of (XeF5)2MnF6 and (NH4)2MnF6.