[Synthesis and characterization of Eu (La) complexes with benzoate and alpha,alpha'-dipyridyl].
A series of dinuclear complexes of different molar ratio of Eu3+ to La3+ with benzoate and alpha,alpha'-dipyridyl have been synthesized in the anhydrous alcohol. Their composition was RE(Dipy)L3.H2O (RE = Eu3+ and La3+, L = C6H5COO-). Their UV spectra and IR spectra were studied. The UV absorption spectral peaks of benzoic acid and alpha,alpha'-dypyridyl shifted 2-9 nm in the complexes. The characteristic anti-symmetric and symmetric stretching vibrations of carboxylate group shifted to lower frequency, while the C=N stretching vibrations shifted to higher frequency in the complexes. These situations show that chemical bonds have formed between the ligands and the rare earth ions. The fluorescence spectra of the complexes were investigated, and the results indicate that the fluorescence emission intensity of europium ion was sensitized by lanthanum ion in the complexes. These facts show that not only the ligands but also the lanthanum complex can transfer the absorbed energy to Eu3+ ion in the complexes.
Zhao
Yong-liang
YL
College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China.
Zhao
Feng-ying
FY
D015082:2,2'-Dipyridyl / Q000737:chemistry; D001565:Benzoates / Q000737:chemistry*; D002614:Chelating Agents / Q000138:chemical synthesis / Q000737:chemistry; D005063:Europium / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D013053:Spectrophotometry
D001565:Benzoates; D002614:Chelating Agents; D005063:Europium; D015082:2,2'-Dipyridyl; D007811:Lanthanum