One-dimensional lanthanide coordination polymers as promising luminescent materials

Four one-dimensional coordination polymers, [Ln(H2O)4(HTDA)(H2TDA)] · H2O [Ln = Sm (1) and Eu (2)]; (H3TDA = 1H-[1,2,3]-triazole-4,5-dicarboxylic acid), [Ln(H2O)4(HTDA)] · (H2TDA) · H2O [Ln = Tb (3) and Dy (4)] were prepared and characterized by IR, elemental analysis, PXRD and single-crystal X-ray diffraction. The powder and single-crystal X-ray crystallographic studies of 1–4 reveal that all compounds are one-dimensional zigzag chain structures. Luminescent studies reveal that they are potential luminescent materials. Moreover, in solution, the emission intensity of 2 increases upon the addition of Ca2+ ions, while introduction of other metal ions leads to either unchanged or decreased intensity, which indicates that 2 may be applied as a promising Ca2+-ion-selective luminescent probe. The basic magnetic properties of 1–4 were also studied.