Abstract
Five new lanthanide complexes Ln(HL) 3(H 2O) 5 · 3H 2O (H 2L = 5-carboxy-1-carboxymethyl-2-oxidopyridinium, Ln = La ( 1), Sm ( 2), Eu ( 3),Tb ( 4), Dy ( 5)) have been synthesized and characterized by elemental analyses, FT-IR spectra and X-ray single crystal diffraction. All crystals are isostructural and crystallize in the triclinic space group P 1 ¯ . The metal center is nine-coordinated completely by two phenol O atoms, two chelating carboxylic O atoms from three HL ligands and five water molecules with a distorted tri-capped trigonal prismatic geometry. Photoluminescence studies revealed that complexes 2– 4 exhibit strong fluorescent emission bands in the solid state at room temperature. The transition intensity varies in the order of Tb 3+ > Dy 3+ > Eu 3+ > Sm 3+.
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