Kristallstruktur von (NH4)3SnF7: Ein Doppelsalz gemäß (NH4)3[SnF6]F und kein (NH4)4SnF8
Abstract
Crystal Structure of (NH 4 ) 3 SnF 7 : A Double Salt According to (NH 4 ) 3 [SnF 6 ]F and not (NH 4 ) 4 SnF 8 (NH 4 ) 3 SnF 7 is obtained as colourless single crystals from the reaction of NH 4 HF 2 with tin powder at 300°C. The crystal structure (cubic, Pm3m, Z = 1, a = 602.5(1) pm at 293 K; a = 598.0(1) pm at 100 K) contains [SnF 6 ] 2− octahedra and lonesome F − ions surrounded by NH 4 + cations only; it may be considered as a derivative of the Cu 3 Au‐type of structure according to Cu 3 [Au]□ (NH 4 ) 3 [SnF 6 ]F. The F − ions of the [SnF 6 ] 2− octahedra with their Sn 4+ centre in the origin of the unit cell at m3m are disordered in different ways at 293 and 100 K, respectively.
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