Synthesis, characterization and luminescent properties of new highly luminescent organic ligand and complexes of trivalent rare earth

A novel ligand with two carboxylic groups has been synthesized. The composition and structure of the ligand were characterized by IR, 1H NMR and MS spectrometry. The highly luminescent intensity complexes were prepared with the ligand and phen. The IR, solid state 13C NMR and fluorescent spectra of the complex were studied. IR absorption spectra indicate that the ligand is coordinated to the Eu3+ ion, and chemical bonds are formed between Eu3+ ion and nitrogen atoms of phen. The fluorescent spectra illustrate that the complex has an excellent luminescence, indicating the ligand favors energy transfer to the emitting energy level of Eu3+. The influences of pH and reaction solvent on the fluorescence intensity of the complex were also discussed.