Trinuclear Rh₂M Complexes (M = Ni, Pd) Bridged by Butyl Selenolato and Carborane Diselenolato Ligands

Two new half-sandwich trinuclear Rh2M (M = Ni, Pd) complexes bridged by butyl selenolato and carborane diselenolato ligands, [Cp*Rh{μ-Se2C2(B10H10)}]2M[μ-Se(C4H9)]2 [M = Ni (4), Pd (5)], have been prepared by the reactions of the [Cp*Rh{μ-Se2C2(B10H10)}{μ-Se(C4H9)}]- anion with NiCl2 and Pd(PhCN)2Cl2, respectively. The complexes have been fully characterized by 1H, 13C, and 11B NMR and IR spectroscopy as well as by element analyses. The molecular structures of 4 and 5 have been determined by single-crystal X-ray diffraction analyses, which show the central MSe4 moiety in a slightly distorted square-planar coordination geometry for M = Ni, Pd.