Crystal structures and luminescent properties of two novel coordination polymers containing Ln and

Two novel lanthanide–sulfate coordination polymers with chelidamic acid (H₃CAM): {Ln₂(HCAM)₂(H₂O)₂SO₄] · 2.5H₂O}_n (Ln = Dy (1) and Tb (2)) have been synthesized under hydrothermal condition. 1 and 2 crystallize in the monoclinic space group P2₁/c. An intriguing bowl-like structure was constructed by three Ln³⁺ ions, one anion and carboxylate O bridges, in which the pentadente mode of anion are observed, and the structure as a repeating unit was assembled into a 1D chain. The luminescent properties of 1 and 2 are studied and exhibit the characteristic bands of the corresponding lanthanide ions.