Studies on the radii dependent lanthanide self-assembly coordination behaviors of a flexible dicarboxylate ligand

Two new lanthanide coordination polymers {[Eu2(BDOA)3(H2O)2] · 2H2O}n (1) and {[Er2(BDOA)3(H2O)2]}n (2) were synthesized by treating the corresponding lanthanide(III) chloride and a flexible ligand benzene-1,4-dioxyacetic acid (H2-BDOA). Single-crystal X-ray studies reveal that the ligand BDOA2− adopts different coordination modes in these complexes. Self-assemblies between these bridging ligands and metal ions result in different three-dimensional coordination polymers. The luminescence property of 1 was investigated in the solid state at room temperature.