A Parallelogram Tetranickel Complex with a Short Ni–Ni Bond Supported by a Pentadentate N-Ligand

Abstract

Metal–metal bonded complexes feature unique intermetallic synergy enabling small-molecule activation and organic transformations. Using a pentadentate N-ligand, a dinickel paddlewheel complex is obtained from NiCl2, while a tetranickel complex with a short Ni–Ni bond in a unique parallelogram geometry is isolated from Ni(COD)2 and converted to μ-oxo halide complexes with aryl halides. Theoretical and catalytic hydrosilylation studies confirm Ni–Ni interactions and cooperative multimetallic behavior distinct from mononuclear nickel complexes.