Homo-chiral self-assemblies and magnetic studies of M(II)-2,2′-bipyridine-4,4′-dicarboxylate coordination polymers

Homochiral self-assembly is a challenging task, especially from achiral components without any chiral auxiliary. Based on rational selection of achiral organic ligand, two kinds of chiral coordination polymers, {Mn(o1,o2-μ-bpdc)(H2O)2}n (1) and {Ni(o1,o1′-μ-bpdc)(H2O)2}n (2) (bpdc = 2,2′-bipyridine-4,4′-dicarboxylate), have been successfully synthesized by hydrothermal reaction. The X-ray single crystal determination and the structural insight indicate that the coordination behaviors of both bpdc ligands and metal ions between the two kinds of coordination polymers are distinct. Temperature dependent magnetic studies reveal that Mn(II) ions in 1 show antimagnetic interactions, while Ni(II) ions in 2 show weakly ferromagnetic interactions.