Syntheses, structures and characterizations of rare earth metal center coordination polymers based on bifunctional ligands

Abstract:

The coordination polymers ([Dy(TZI)(H2O)4]•4H2O (1) and [La(HTZPI)(HC2O4)(H2O)3]•H2C2O4 (2)) have been synthesized by involving the bifunctional ligands (5-tetrazolylisophthalic acid (H3TZI) and 5-(4-(1H-tetrazolyl) phen) isophthalic acid (H3TZPI)) as linkers coordinating with rare earth metal ions (Dy3+/La3+). The using synthesis methods are hased on solvothermal synthesis and slow solvent evaporation. Crystal structures are characterized by X-ray single crystal diffraction, which show that the two compounds correspond to one-dimensional double-stranded chain and two-dimensional layer structure, respectively. It is notable that for this bifunctional ligand the tetrazolyl group is invalid when it coordinates with rare earth metal centers. Meanwhile, the thermal stabilities and the luminescent properties of them are investigated.

Key words:Coordination polymer; Crystal structure; Rare earth metal