Hydrothermal syntheses, structural characterization, and photoluminescent properties of five lanthanide coordination polymers

摘要

Five mixed-ligand coordination polymers, [Ln_2(PTCP)_2(m-BDC)_3]_n · nH_2O (Ln = Pr (1), Sm (2), Eu (3), Tb (4), Dy (5); m-BDC= 1,3-benzenedicarboxylate; PTCP = 2-phenyl-lH-1,3,7,8-tetraazacyclopenta[l]phenanthrene), were synthesized and characterized by IR spectra, elemental analyses, thermogravimetric analyses, single-crystal X-ray diffraction, and solid-state photoluminescent spectra. X-ray crystallographic analyses reveal that the five complexes are 1-D structures based on dinuclear [Ln_2O_(12)N_4] units and further assembled into 3-D supramolecular networks by hydrogen bonds and π ··· π stacking interactions. The solids possess high thermal stabilities, with 3 and 4 exhibiting strong pure red and green characteristic emissions of Eu(III) and Tb(III) at room temperature.