Carbocyclic complexes incorporating macrocyclic ligands. The synthesis and single crystal X-ray structure of the binuclear species [Rh 2 (η-C 5 Me 5 ) 2 Cl 2 (L)](BPh 4 ) 2 (L = 1,4,7,10,13,16-hexathiacyclo-octadecane)

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 RhIII 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).