Solvothermal synthesis and spectroscopic characterization of three lanthanide complexes with high luminescent properties [H2NMe2]3[Ln(III)(2,6-pyridinedicarboxylate)3] (Ln = Sm, Eu, Tb): In the presence of 4,4'-Bipyridyl

Three lanthanide complexes, [H2NMe2](3)[Ln(III)(2,6-pyridinedicarboxylate)(3)] (Ln = Sm, Eu, Tb) have been successfully synthesized using a solvothermal method in the presence of a base and they were prepared from inexpensive and readily available reactants. Infrared, ultraviolet visible absorption spectroscopies, elemental analyses and thermogravimetric analysis were employed for the characterization. Crystals suitable for X-ray diffraction were isolated in good yields by a simple filtration, their crystal structures were analyzed; the samarium structure has orthorhombic symmetry with space group Pbcn, exhibiting three-dimensional supramolecular architecture through hydrogen bonding interactions. The metal center is coordinated to nine atoms corresponding to three pyridine-2,6-dicarboxylic acid molecules. These compounds are thermally stable up to 270 C. Published by Elsevier B.V.