3D pillar-layered 4d–4f heterometallic coordination polymers based on pyridine-3,5-dicaboxylate and oxalate mixed ligands

Three 4d–4f heterometallic polymers, Ln2Ag2(Hpydc)2(pydc)2(ox) · 4H2O (Ln = Nd (1), Eu (2) and Er (3); H2Pydc = pyridine-3,5-dicarboxylic acid, H2ox = oxalic acid), have been successfully synthesized under hydrothermal condition and structurally characterized. Single-crystal X-ray diffraction analyses reveal that three compounds are isomorphous and exhibit 3D pillar-layered coordination frameworks constructed from two-dimensional lanthanide-carboxylate layers and [Ag(pydc)]− pillars. Furthermore, the luminescent property of compound 2 was studied.