A novel three-dimensional 3d–4f heterometallic coordination polymer: Crystal structure and photoluminescence

A novel 3d–4f heterometallic coordination polymer {[ZnEu(PDA)2(BDC)1/2(H2O)] · 2H2O}n (PDA = pyridine-2,5-dicarboxylate, BDC = 1,4-benzenedicarboxylate) (1) has been synthesized by hydrothermal method. PDA ligands adopt two kinds of coordination modes to bridge Eu(III) and Zn(II) ions into two types of 2D layers, respectively, which further intersect at Eu(III) ions and form a 3D network. BDC ligands act as a linear linker to bridge the Eu(III) ions from adjacent layers, resulting in the final 3D network. The photoluminescent behavior indicates that the introduction of Zn ions in the 3-D polymeric fragment slightly enhances the luminescent lifetime and quantum efficiency.