Iron(II), Cobalt(II), and Nickel(II) Complexes of a Cyclic (Alkyl)(amino)carbene

Abstract

Abstract Reactions of a sterically demanding cyclic (alkyl)(amino)carbene (CAAC) with FeCl2(thf)1.5, CoBr2, and NiBr2(dme) afforded the complexes [FeCl(μ‐Cl)(CAAC)]2 (1), [CoBr(μ‐Br)(CAAC)]2 (2), and [NiBr(μ‐Br)(CAAC)]2 (3) in moderate yields. Compounds 1–3 were characterized by X‐ray crystallography, 1H NMR, and UV/Vis spectroscopy. Dimeric, halide‐bridged structures were observed in the solid state, in which the metal atoms are coordinated in a distorted tetrahedral fashion by the CAAC and three halide ligands. The solution magnetic moments in THF and dichloromethane indicate a high‐spin electronic configuration.