3D heterometal–organic frameworks based on oxydiacetic acid

Abstract

Using the flexible ligand, oxydiacetic acid (H₂oda), three heterodimetallic coordination polymers, {[La₂(oda)₆Zn₃(H₂O)₆]·6H₂O}_n (La–Zn), {[La(oda)₃Mn]₂[Mn(H₂O)₆]·6H₂O}_n (La–Mn), and {[La₂Pb(oda)₄(H₂O)₄]·4H₂O}_n (La–Pb) were synthesized and structurally characterized. La–Zn possesses a highly ordered 3D structure with nano-sized hexagonal channels. La–Mn represents a kind of anionic porous framework, which is rare in zeolite-like 3D HMOFs. La–Pb is the first example of 6p–4f HMOFs. The framework consists of both left-handed and right-handed helices. Thermal and porosity properties of the three complexes were preliminary studied.