Two types of lanthanide coordination polymers showing luminescence and magnetic properties

Lanthanide coordination polymers (Ln-CPs) ([Ln(HL)(2)(H2O)(3)]center dot(H2O)(4)center dot Cl)(n,) (Ln = Dy, 1; Eu, 2; Sm, 3) and [Ln(0.18)(HL)(0.18)(CH3COO)(0.36)(H2O)(0.54)](n) (Ln = La, 4; H2L = 2-(hydroxymethyl)-1H-benzo[d]imidazole-5-carboxylic acid) have been successfully assembled by Ln(3+) 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 0 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 I has a weak anti ferromagnetic interaction. (C) 2019 Elsevier Ltd. All rights reserved.