Structural diversity of bimetallic rhodium and iridium half sandwich dithiolato complexes

Abstract

The synthesis of a range of rhodium(III) and iridium(III) half sandwich complexes with aryl dithiolato ligands of varying geometry and flexibility are reported. These include dinuclear [Cp*M(S–R–S)]₂ complexes 3b and 4b, M = Rh, Ir; S–R–S = naphthalene-1,8-dithiolate (b) and four dinuclear complexes bearing bridging dithiolate ligands [(Cp*M)₂(μ₂-Cl)(μ₂-S–R–S)]Cl 3c, 4c, 5b, 6b, M = Rh, Ir; S–R–S = naphthalene-1,8-dithiolate (b) or acenaphthene-5,6-dithiolate (c). The introduction of a less rigid biphenyl dithiolate backbone resulted in the tetranuclear dicationic complex [(Cp*Rh)₄(S-R-S)₃]Cl₂ (3d), S–R–S = biphenyl-2,2′-dithiolate (d) with dithiolate ligands in two different bridging modes. All new complexes were fully characterised by multinuclear NMR, IR, Raman and MS spectroscopy and single crystal X-ray diffraction.