Series of Cd(II) and Pb(II) Coordination Polymers Based on a Multilinker (R,S-)2,2′-Bipyridine-3,3′-dicarboxylate-1,1′-dioxide

Abstract

Six new metal–organic frameworks (MOFs) with structures ranging from a one-dimensional (1D) chain, two-dimensional (2D) layer, even 2D double layer to three-dimensional (3D) network based on 2,2′-bipyridine-3,3′-dicarboxylate-1,1′-dioxide (H2bpdado) and N-donor ligands (1,2-bis(4-pyridyl)ethane (bpa) or 1,2-trans-bis(4-pyridyl)ethene (bpe)), namely, [Cd(bpdado)(H2O)2]n (1), {[Cd2(bpdado)2(bpa)(H2O)2]·DMF·3H2O}n (2), {[Cd2(bpdado)2(bpe)(H2O)2]·8.5H2O}n (3), {[Pb2(bpdado)2(bpa)]·10H2O}n (4), {[Pb2(bpdado)2(bpe)]·10H2O}n (5), [Pb2(bpdado)Cl2(H2O)2]n (6), were synthesized by hydro(solvo)thermal and/or diffusion methods. In these complexes, the bpdado ligand shows four types of coordination modes, three of which appeared for the first time. Polymers 1–6 present diverse motifs with different metal ions and different conformations and/or coordination modes of bpdado, which may show a natural synergy in structural diversity of the resultant MOFs. Under the similar synthetic conditions just with different metals (...