Ag[MF₆]₂ (M  Nb, Ta), Ternary fluorides of Divalent Silber^†

High-pressure fluorination (p ≈ 3 kbar) of Ag₂O/Ta₂O₃ mixtures afforded brilliant-blue single crystals of Ag[TaF₆]₂. The crystal structure is surprisingly simple: three isolated and noticeably elongated AgF₆ octahedra are each coupled cis with one another above and below the (100) plane via TaF₆ octahedra. The magnetic behavior—paramagnetism—is understandable, but F-bridges, through which magnetic interactions could take place, are lacking.