Zn(II)/Cd(II) based coordination polymers synthesized from a semi-flexible dicarboxylate ligand and their emission studies

Three new coordination polymers (CPs) of Zn(II)/Cd(II) have been synthesized using a dicarboxylate ligand, H2L = 5-(benzylamino)isophthalic acid, under hydro(solvo)thermal conditions. This ligand readily reacts with Zn(II) and Cd(II) metal salts to afford three CPs, {[Zn8(L)6(μ3-OH)4(H2O)6]·(DMF)·(H2O)2.5}n (1), [Zn(L)]n (2) and [Cd(L)(DMF)]n (3). All the complexes have been characterized by single crystal X-ray crystallography (XRD), IR spectroscopy, elemental analysis, thermogravimetry (TGA) and X-ray powder diffraction (PXRD). Single crystal X-ray studies reveal that 1–3 contain homometallic clusters, with SBUs varying from dimeric to tetrameric, depending upon the metal salts as well as the reaction conditions. Topologically, 1 represents an sql net, whereas 2 and 3 exhibits rare ptr and fes topological nets respectively. Luminescence studies were also carried for complexes 1–3, which exhibit emissions as a pair of bands upon excitation at 405 nm.

Three new coordination polymers have been synthesized using a semi-flexible dicarboxylic acid ligand under hydro(solvo)thermal conditions. They represent homometallic clusters with SBUs varying from dimeric to tetrameric, and show diverse topological architectures. Solid-state luminescence studies of complexes 1–3 have also been carried out at room temperature.Figure optionsDownload as PowerPoint slide