A Five-Coordinate Phosphino/Acetate Iron(II) Scaffold That Binds N_2, N_2H_2, N_2H_4, and NH_3 in the Sixth Site

摘要

A family of iron(II) complexes that coordinate dinitrogen, diazene, hydrazine, and ammonia are presented. This series of complexes is unusual in that the complexes within it feature a common auxiliary ligand set and differ only by virtue of the nitrogenous N_xH_y ligand that occupies the sixth binding site. The ability of an iron center to bind N_2, N_2H_2, N_2H_4, and NH_3 is important to establish in the context of evaluating catalytic N_2 reduction schemes that invoke these nitrogenous species. Such a scenario has been proposed as an iron-mediated, alternating reduction scheme within the cofactor of nitrogenase enzymes.