Three PbII coordination polymers based on 2-(pyridin-2-yl)-1H-imidazole-4,5-dicarboxylic acid: Syntheses, crystal structures, and fluorescent properties

Abstract

Abstract Three lead coordination polymers, [PbCl(C10H6N3O4)(H2O)·H2O]n (1), [Pb(C10H6N3O4)2(H2O)]n (2) and [Pb3(C10H5N3O4)3]n (3) (C10H7N3O4=2-(pyridin-2-yl)-1H-imidazole-4,5-dicarboxylic acid), have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. In 1, Cl anions connected neighboring wave-like 2D layers, which are constructed with left- and right-handed helical chains, into a 3D network structure with a (63)(65·8) topology. In 2, Pb cations are linked into a 3D 66 network with left- and right-handed helixes by μ2-bridging C10H6N3O4− ligands. In 3, C10H5N3O42− ligands link Pb6O12 clusters into a 3D (412·63) network. Their fluorescent properties were also investigated.