Synthesis, Structure and Properties of Sm(III) and Dy(III) Complexes with Pyridine-2,5-dicarboxylic Acid

Two new Lanthanide complexes [Ln(pydc)(2)(H2O)(5)]center dot 4H(2)O (Ln=Sm (1), Dy (2)) were obtained by the hydrothennal reactions of Ln(NO3)(3)center dot 6H(2)O, pyridine-2,5-dicarboxylic acid (H(2)pydc) with 1:1 mole ratio. Single-crystal X-ray diffraction analysis reveals that both the crystals belong to monoclinic,space group C2/c. The structure and property of complexes have been characterized by elemental analysis, thermal analyses, IR spectra and Fluorescence. The single crystal structures show that the two complexes are isomorphic and have zero-dimensional structures and hydrogen bonds result in three-dimensional supramolecular structures. the coordination number of central ion Ln(III) is nine. The complex 1 and 2 exhibit intense luminescence in the liquid state at room temperature. CCDC: 869044, 1; 874032, 2.