Synthesis,characterization and fluorescence of Sm~(3+) and Dy~(3+) complexes with 2-thiophencarboxylic acid-2,2′-bipyridine

Two ternary complexes of Sm3+ and Dy3+ with 2,2′-bipyridine 2-thiophene carboxylic acid(L)-have been synthesized.By using the elemental analysis,the rare earth coordination titration,the molar conductivity and TG-DTG studies,the composition of the complexes was suggested as REL3L′·C2H5OH(RE=Sm,Dy,L=2-thiophene carboxylic acid,L′=2,2′-bipyridine).The molar conductivities in DMF solvent indicated that the complexes were non-electrolyte.The coordination compounds were characterized by IR spectrometry.The IR spectra studies indicated that 2-thiophene carboxylic acid was bonded with RE(Ⅲ) through oxygen atoms in carboxyl group,while 2,2′-bipyridine ligand was bonded to RE(Ⅲ) through two nitrogen atoms.And Dy3+ternary complexes were studied by the fluorescence excitation and emission spectrometry.