Structural Diversity in Metal Complexes with a Dinucleating Ligand Containing Carboxyamidopyridyl Groups

摘要

The synthesis of a carboxyamidopyridine-pyrazolate dinucleating ligand (H5bppap) is described. Bimetallic iron and cobalt complexes of H5bppap ([M^II2H2bppap]⁺) showed structural differences in both their primary and secondary coordination spheres. The binding of small molecules into the pre-organized ligand cavity is verified by the hydration of [Fe^II2H2bppap]⁺ and [Co^II2H2bppap]⁺, leading to the formation of the complexes [{Co^II(OH)}Co^IIH3bppap]⁺ and [{Fe^II(OH)}-Fe^IIH3bppap]⁺, in which one of the metal centers has a terminal hydroxo ligand.