Two types of lanthanide coordination polymers showing luminescence and magnetic properties.

Lanthanide coordination polymers have been successfully assembled by Ln3+ ions and asymmetric carboxylic acid ligand under solvothermal conditions. The structure analysis display that complexes 1 – 3 are isostructural three-dimensional (3D) supramolecular network. Furthermore, luminescence properties of complexes 1 – 4 have been measured in the solid state at room temperature. Complex 2 exhibits a strong red luminescence upon excitation at 283 nm and its lifetimes is 33.554 ns. In addition, magnetic studies reveal that complex 1 has a weak antiferromagnetic interaction. Lanthanide coordination polymers (Ln-CPs) {[Ln(H L) 2 (H 2 O) 3 ]·(H 2 O) 4 ·Cl} n (Ln = Dy, 1 ; Eu, 2 ; Sm, 3) and [Ln 0.18 (H L) 0.18 (CH 3 COO) 0.36 (H 2 O) 0.54 ] n (Ln = La, 4 ; H 2 L = 2-(hydroxymethyl)-1 H -benzo[ d ]imidazole-5-carboxylic acid) have been successfully assembled by Ln3+ ions and asymmetric carboxylic acid ligand under solvothermal conditions. The structures of the complexes 1 – 4 were determined by single crystal X-ray diffraction and further characterized by elemental analyses, IR spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA). The structure analysis display that complexes 1 – 3 are isostructural three-dimensional (3D) supramolecular network. Complexes 1 – 4 were constructed by hydrogen bonding interactions between the coordinated water molecules and the O atoms of the hydroxy group or free chloride ions. Furthermore, luminescence properties of complexes 1 – 4 have been measured in the solid state at room temperature. Complex 2 exhibits a strong red luminescence upon excitation at 283 nm and its lifetimes is 33.554 ns. In addition, magnetic studies reveal that complex 1 has a weak antiferromagnetic interaction. [ABSTRACT FROM AUTHOR]