Stability enhancement of heavy-metal–macrocycle complexes via pendant amide coordination

Abstract

Formation of the pendant-arm macrocyclic ligand 1,4,7,10-tetrakis(carbamoylmethyl)-1,4,7,10-tetraazacyclododecane L and subsequent generation of its cadmium(II) complex indicates very significant stabilisation of the complex, compared to that observed for related macrocyclic cadmium(II) complexes, which either lack pendant donors altogether, or have other types of neutral oxygen donors attached to the macrocycle, and compared to complexes of L with lighter metal ions.