Synthesis, characterization and luminescence properties of a coordination polymer based on self-assembly of Pr~(III) with inorganic-organic hybrid bridging ligands

摘要

A new coordination polymer having the formula [Pr(mu_5-S_2O_3)(mu_4-tp)_(0.5)(H_2O)]_n (1) (S_2O_3 = thiosulfate dianion; tp = terephthalate dianions) was obtained by in situ reaction of Pr_2(SO_4)_3 centre dot 6H_2O with H_2tp ligands under solvothermal conditions (H_2O/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 Pr~(III) 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.