Structures of some inorganic xenon compounds

The structure and bonding of the [AuXeJ2 1 cation in (AuXe4)(Sb2Fn)2 have been discussed in Section 2.4.3. Some other interesting inorganic xenon compounds are described below. 

Although the XeJ cation is known to exist from Raman spectroscopy, with i (Xe-Xe) = 123 cm-1, its bond length was only determined in 1997 from the crystal structure of Xe2Sb4F2i. The Xe-Xe bond length is 309 pm, the longest recorded homonuclear bond between main-group elements. 

In the crystal structure of [XeF3 ] [Sb2Fn ], the T-shaped XeF cation is nearly coplanar with a F atom of a SbiF group in a close Xe- F contact, as shown below. The terminal Sb-F bond lengths of the anion lie in the range 183-9 pm. 

The crystal structure of [XeF5] AgF4] consists of alternate stacks of double layers of square-pyramidal XeFlj cations and approximately square-planar AgF anions (site symmetry D2h, Ag-F = 190.2 pm). The XeFj- ion has C4v symmetry with Xe-F(ax) = 185.2, Xe-F(eq) = 182.6 pm, and F(ax)-Xe-F(eq) = 77.7°. Each cation lying on a 4-axis interacts with one bridging F ligand of each of four anions at 263.7 pm, as illustrated below  

The [Xe2F3]+ cation in [Xe2F3][AsF6] is V-shaped, as shown below  

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Structures of some inorganic xenon compounds (a) FXe0S02F, (b) FXeN(S02F)2, and (c) [Xe2OgCl4ln ... 

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