A one-dimensional lead(II) coordination polymer with terminal and bridging 5-carboxy-2-(pyridin-3-yl)-1H-imidazole-4-carboxylate ligands

In the coordination polymer catena-poly[[[diaqua[5-carboxy-2-(pyridin-3-yl)-1H-imidazole-4-carboxylato-κ(2)N(3),O(4)]lead(II)]-μ-5-carboxy-2-(pyridin-3-yl)-1H-imidazole-4-carboxylato-κ(3)N(3),O(4):N(2)] dihydrate], {[Pb(C10H6N3O4)(H2O)2]·2H2O}n, the two 5-carboxy-2-(pyridin-3-yl)-1H-imidazole-4-carboxylate ligands have different coordination modes, one being terminal and the other bridging. The bridging ligand links Pb(II) cations into one-dimensional coordination polymer chains. The structure is also stabilized by intra- and interchain π-π stacking interactions between the pyridine rings, resulting in the formation of a two-dimensional network. Extensive hydrogen-bonding interactions lead to the formation of a three-dimensional supramolecular network.