Three multifunctional coordination polymers based on the amide-functionalized N2,N5-di(pyridin-3-yl)thiophene-2,5-dicarboxamide ligand (Nptp): Synthesis, magnetic properties and luminescent sensing for Pb2+, Cr2O72− and acetone

Abstract

Three three-dimensional (3D) transition metal coordination polymers (CPs), formulated as [Zn(Nptp)(HBTC)]n (1), [Mn(Nptp)(HBTC)]n (2) and [Co(Nptp)(HBTC)]n (3), have been designed and synthesized using the amide-functionalized ligand N2,N5-di(pyridin-3-yl)thiophene-2,5-dicarboxamide (Nptp) and benzene-1,3,5-tricarboxylic acid (H3BTC) under solvothermal conditions. The structures of the CPs 1–3 have been identified by single-crystal X-ray diffraction analyses and further characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD) and thermal gravimetric analyses (TGA). The structure analyses show that 1–3 are isostructural 3D supramolecular networks. Furthermore, fluorescent measurements showed 1 exhibits highly selective detection for Pb2+ and Cr2O72− ions in aqueous solution and the acetone small molecule, which shows that 1 could be a good candidate as a multifunctional sensory material. Meanwhile, magnetic susceptibility measurements indicated that 2 and 3 exhibited weak antiferromagnetic behavior.