Cobalt(ii) amido complexes derived from a monodentate arylamido ligand featuring a highly electron-withdrawing C6F5 substituent

Abstract

A series of cobalt(II) complexes of a highly electron-withdrawing amido ligand, [N(C₆F₅)(C₆H₃Prⁱ₂-2,6)]⁻ (L), were synthesized and structurally characterized. Mononuclear [CoL(Cl)(TMEDA)] (3) and heterobimetallic [CoL₂(μ-Cl)Li(THF)₃] (4) were obtained by direct metathetical reactions of anhydrous CoCl₂ with one molar equivalent of [LiL(TMEDA)] (1) (TMEDA = Me₂NCH₂CH₂NMe₂) and [LiL(THF)₃] (2), respectively. Complex 3 underwent facile ligand substitution reactions with LiMe and NaN₃, yielding the corresponding mixed-ligand complexes [CoL(X)(TMEDA)] (X = Me 5, N₃6). Treatment of 3 with NaOMe led to the heterobimetallic complex [CoL₂(μ-OMe)Na(TMEDA)] (7). The solid-state structures of complexes 1–7 were established by X-ray diffraction analysis.