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Citation: DANG Fang-Fang, CUI Yu-Ming, YANG Ying. Synthesis,Characterization and Fluorescence Properties of Rare Earth Complexes with 2-Butenedioic Acid (Z)-Monophenyl Ester[J]. Chinese Journal of Applied Chemistry, ;2005, 22(6): 647-651. shu

Synthesis,Characterization and Fluorescence Properties of Rare Earth Complexes with 2-Butenedioic Acid (Z)-Monophenyl Ester

1.
Institution of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000

Corresponding author: YANG Ying,
Received Date: 20 August 2004
Available Online: 13 December 2004
Fund Project:

2-Butenedioic acid (z)-monophenyl ester and its solid rare earth complexes REL₃·4H₂O(RE=La³⁺,Ce³⁺,Sm³⁺,Eu³⁺,Gd³⁺,Tb³⁺,Y³⁺) were synthesized and characterized by means of elemental analysis,TG-DTA,IR and NMR.The results show that the frequency differences (Δν)(100~124 cm^-1) of the carboxylic stretching in the complexes were much smaller than that in the corresponding sodium salt NaL (about 196 cm^-1),which indicates that the carboxylic groups in the complexes coordinate to the rare earth ions in the form of a bidentate ligand.The ν_C=O of the ester groups in the complexes shifted to higher wave numbers in the 1 740~1 743 cm^-1 region,which suggests that the ethereal oxygen in the complexes coordinates to RE³⁺,but the carbonyl oxygen of the ester does not take part in the coordination.The NMR study has proved this conclusion.In the four water molecules,just one coordinates to the cation.The fluorescence spectra of the complexes in solid state were also studied.The strong fluorescence emitting peaks at 617 nm for Eu³⁺ and 545 nm for Tb³⁺ observed could be attributed to the effective energy transfer between the ligand triplet levels and the emitting levels of the Eu³⁺ and Tb³⁺.
- butenedioic acid(z)-monophenyl ester,
- rare earth complex,
- fluorescence
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