The PF₆⁻/BF₄⁻ Mixed Salt of the Cluster Cation [Pt₃(μ₃-AuPPh₃)(μ-dppm)₃]⁺, dppm = Ph₂PCH₂PPh₂

Remarkably, the crystal structure of this Pt₃Au cluster compound, tris[bis(diphenylphosphino)methane]2:3κ²P:P'; 2:4κ²P:P'; 3:4κ²P:P'-(triphenylphosphine)1κP-tetrahedro-1-gold-2,3,4-triplatinum(3 Au-Pt, 3 Pt-Pt) 0.75-hexafluorophosphate 0.25 tetrafluoroborate, [Au-Pt₃(C₂₅H₂₂P₂)₃(C₁₈H₁₅P)](BF₄)_0.25(PF₆)_0.75, is based on an F-centred cubic unit cell which contains 32 [Pt₃(μ₃-AuPPh₃)(μ-dppm)₃]⁺ cations, together with 24 PF₆⁻ and eight BF₄⁻ anions. Each cation straddles a crystallographic threefold axis and contains a triangular Pt₃ unit whose edges are bridged by the three dppm ligands. The Pt₃ triangle is capped by an AuPPh₃⁺ fragment to form a tetrahedral Pt₃Au cluster with a slight trigonal elongation. The Pt-Pt and Pt-Au bond lengths are 2.618 (2) and 2.707 (2) Å, respectively.

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