Synthesis, characterization and luminescence properties of a coordination polymer based on self-assembly of PrIII with inorganic–organic hybrid bridging ligands

Abstract

A new coordination polymer having the formula [Pr(μ 5-S2O3)(μ 4-tp)0.5(H2O)] n (1) (S2O3 = thiosulfate dianion; tp = terephthalate dianions) was obtained by in situ reaction of Pr2(SO4)3 · 6H2O with H2tp ligands under solvothermal conditions (H2O/ethanol). The coordination polymer obtained was characterized by elemental analysis, FT-IR, thermogravimetry (TG), fluorescent spectra and single crystal X-ray diffraction analysis. The most intriguing structural feature is that the complex exhibits a 3D open framework resulting from bridge-linking coordination between ligands and praseodymium ions. Additionally, 1 has characteristic emission spectra of PrIII with good fluorescence properties. This is the first coordination polymer based on thiosulfate/terephthalate ligands and a rare earth metal and has an unprecedented pentadentate-bridge-linking coordination mode of the thiosulfate group.