Synthesis and Structure of 6-Aminofulvene-2-aldiminate Complexes

We report here a synthetic route to bis(N,N′-aryl)-6-aminofulvene-2-aldimine (AFA) ligand systems, specifically Ph2-AFAH and Dip2-AFAH. The synthesis and structural characterization of a series of Cu(I) complexes [(Ph2-AFA)Cu(CNPh)2] (2), [(Ph2-AFA)Cu(CN i Pr)] (3), and [(Dip2-AFA)Cu(CN i Pr)] (4), from the reaction of the corresponding lithiated AFA systems with Cu−Cl derivatives are reported; notably in the case of [(Ph2-AFA)Cu(CNPh)2] studies have revealed the existence of two structural isomers (2a and 2b), both of which can be isolated and structurally characterized. Density functional theory (DFT) calculations suggest that the two crystal forms are comparatively close in energy, and geometry optimization reveals a convergence of these two forms to a geometry that more closely resembles the solid-state structure of isomer 2b, having a CH···π interaction. The reactions of the AFA compounds Ph2-AFAH and Dip2-AFAH with ZnMe2 and AlMe3 have also been investigated, and the results of these reactions are described here.