[Study on photoluminescence of 2-(4-chloro-benzoyl)benzoic acid complexes].

Eight complexes of europium and terbium were synthesized, with 2-(4-chloro-benzoyl)benzoic acid as an essential ligand and other three distinct ligands, including 1, 10-phenanthroline, triphenylphosphine oxide and diphenyl sulfoxide, as selective ligands. They were Eu(CBBA)3 (H2O)4, Eu(CBBA)3 (Phen) (H2O)6, Eu(CBBA)3 (TPPO) (H2O)4, Eu(CBBA)3 (DPSO) (H2O)5, Tb(CBBA)3 (H2O)4, Tb(CBBA)3 (Phen)(H2O)3, Tb(CBBA)3(TPPO)(H2O)2 and Tb(CBBA)3 (DPSO)(H2O)4, respectively. Then their excitation and emission spectra were measured, and that how the central ions were differently impacted by the three second ligands was also compared.

[Study on synthesis, structure characterization and fluorescence of europium complexes of 2-(4-fluorobenzoyl) benzoic acid].

The present paper reports three new europium complexes, EuL3(H2O)6, EuL3Phen(H2O)4 and EuL3 (TPPO) (H2O)5, synthesized with Eu(NO3)3 x 6H2O, 2-(4-fluorobenzoyl) benzoic acid, Phen and TPPO(L = 2-(4-fluorobenzoyl) benzoic acid, Phen = 1, 10-phenanthroline, TPPO = triphenyl phosphine oxide). Their composition and chemical structures were characterized by elemental analysis, IR and 1H NMR spectroscopy. The IR spectra indicated that all complexes exhibited the characteristic peaks of carboxylate, asymmetric stretching vibration (vas (CO2(- and symmetric stretching vibration (vs (CO2(- peaks; the C = O stretching band at 1,692 cm(-1) of COOH and the O--H stretching band around 2,500-3,200 cm(-1) disappeared.

[Influence of inert nuclei (La3+, Y3+ and Gd3+) on fluorescence of europium complex with phenylglyoxylic acid and phenathroline].

Three series of dinuclear complexes (Eux RE(1-x) L3 phen) of phenylglyoxylic acid and phenathroline with different molar ratios of Eu3+ to inert nuclei (RE = La3+, Y3+ and Gd3+) were synthesized. Their excitation and emission spectra were studied. The excitation spectra showed that the optimum excitation wavelengths of the complexes are all in the range of 350-360 nm, which belong to the excitation peaks of ligands, and the weak excitation peak of Eu3+ is at about 398 nm; The emission spectra showed that there are five emission bands at about 583, 595, 617, 654 and 703 nm respectively for all the complexes, due to (5)D0 - (7)F0, (5)D0 - (7)F1, (5)D0 - (7)F2, (5)D0 - (7)F3 and (5)D0 - (7)F4 transitions of Eu3+ respectively.

[Synthesis, structure characterization and, fluorescence studies of the complexes of europium with phenylglyoxylic acid, 1,10-phenanthroline and triphenyl phosphine oxide].

Three novel europium complexes, Eu-L, EuL3phen and EuL2 (TPPO)2NO3, were synthesized (HL = phenylglyoxylic, phen= 1,10-phenanthroline, and TPPO = triphenyl phosphine oxide). The complexes were characterized by elemental analysis, conductivity, IR, and 1H NMR. The IR spectra indicated that all the complexes have a larger deltaupsilon(upsilon(as) (CO2-) - upsilon(s)(CO2-) than that of NaL, and carboxylate ions in the phenylglyoxyate coordinated as unidentate ligands.