Synthesis, Characterization and Fluorescence Studies on Complexes of Terbium with Phenylglyoxylic Acid, 2,2-Dipyridine, 1,10-Phenanthroline, Triphenyl Phosphine Oxide

摘要

Three new complexes TbL3dipy（H2O）2, TbL3phen（H2O）2 and TbL2（TPPO）2NO3 have been synthesized （L=phenylglyoxylate ion, dipy=2,2-dipyridine, phen=1,10-phenanthroline, TPPO=Triphenyl phosphine oxide）. Elemental analysis, conductivity, IR spectra and 1HNMR spectra studies were performed on them. IR spectra indicate that carboxylate ions in the phenylglyoxylate are coordinated to Tb（Ⅲ） ions as unidentate ligands. In 1HNMR, the signals of hydrogens in phenylglyoxylate shift upfield. The excitation and emission spectra of the three complexes were recorded at room temperature, the excitation spectra show that the optimum excitation wavelengths are 361.0, 359.0 and 367.0 nm, respectively. Four emission bands due to 5D4-7Fj（j=6, 5, 4, 3）transitions were observed for TbL3dipy（H2O）2 （489.0, 545.0, 584.0,620.0 nm） and TbL3phen（H2O）2 （490.0, 544.0, 583.0, 620.0 nm）. And under the same conditions, only one emission band due to 5D4-7F5 transition was observed for TbL2（TPPO）2NO3. The emission intensity of TbL3dipy（H2O）2 is the strongest among the three complexes.