Carbocyclic complexes incorporating macrocyclic ligands. The synthesis and single crystal X-ray structure of the binuclear species [Rh2(η-C5Me5)2Cl2(L)](BPh4)2(L = 1,4,7,10,13,16-hexathiacyclo-octadecane)

Abstract

The isoelectronic binuclear arene and C₅Me₅ platinum metal complexes [Rh₂(η-C₅Me₅)₂Cl₂(1)]²⁺ and [M₂Cl₂(arene)₂(1)]²⁺(M = Ru, arene = C₆H₆ or 4-MeC₆H₄Prⁱ; M = Os, arene = 4-MeC₆H₄Prⁱ)[(1)= 1,4,7,10,13,16-hexathiacyclo-octadecane] have been synthesised; the single crystal X-ray structure of [Rh₂(η-C₅Me₅)₂Cl₂(1)](BPh₄)₂ shows a centrosymmetric structure with each Rh^III ion bound to two sulphur donor atoms of the hexathia ligand [Rh–S 2.377(1) and 2.365(1)Å], one Cl^–[Rh–Cl 2.387(1)Å], and the C₅Me₅^– ring (mean Rh–C 2.173 Å).