Synthesis And Properties Of Rare Earth Lanthanide Coordination Polymers Stacked By Phenanthroline And Its Derivatives

Coordination polymers (MOFs) have attracted more attentions due to potential applications such as gas-storage/gas-separation, drug delivery, catalysis and chemical sensing. As for the luminescent materials, rare earth lanthanides have been attracted more attentions in the fields of PL (photoluminescence) and EL (electroluminescence) owing to the luminescence quantum efficiency, luminescence brightness and line-like monochromaticity. The organic aromatic acid alternately serves as the first ligand, which is responsible for the photon entrapment, due to the strong absorption at ultraviolet zone. The incorporation of the second ligand to the coordination system such as 1,10-phenanthroline and its derivates aims to prevent the water coordination to lanthanide which would influence the luminescence quantum efficiency and enhance the luminescence brightness by the synergic interaction with the first ligand.In this paper,{[Eu(phen)]2·(cpoa)3}·0.5H2O (Ⅰ), built up from two kind of ligands, has been hydrothermally synthesized and structurally characterized by X-ray single-crystal diffraction. Two Pr-based coordination polymers,{[Pr(phen)]2·(p-cpoa)3}·0.5H2O (phen= 1,10-phenanthroline,p-cpoa=4-carboxyphenoxyacetic acid) (Ⅱ)and{[Pr(phen)]2-L2-bpdc} (L=4,4’-bis(2-sulfonatostyryl) bi-phenyl and bpdc= biphenyl-4,4’-dicarboxylic acid) (III) have been hydrothermally synthesized and structurally determined.Synthesis of coordination polymers were tested solid fluorescent properties,the analysis shows that the synthesis of coordination polymers with good luminescence properties. The photoluminescence of{[Eu(phen)]2·(cpoa)3}·0.5H2O with p-cpoa as the antenna as well as the synergic phen shows the intense red luminescence. The result of photoluminescence indicates that compound II shows the intense luminescence.