光谱学与光谱分析 |
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Synthesis and Spectral Characterization of Rare Earth Complexes of Acylpyrazolone-β-Alanine |
LI Jin-zhou, YU Zhi-gang, AN Yu-mei, YANG Yu |
Department of Chemistry, Harbin Normal University, Harbin 150080, China |
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Abstract In non-aqueous solvent, a new amino-acid schiff base, 1-phenyl-3-methyl-4-benzoyl pyrazolone-5-β-alanine (HL) was synthesized by a reaction of β-alanine with benzoylpyrazolone, and its ten rare earth complexes were obtained from refluxing a solution of schiff base and rare earth nitrates. On the basis of elemental analysis and molar conductance, the general formula of the complexes, [REL2NO3]·nH2O (RE=La, Sm, Eu, Tb, Y, n=2; RE=Pr, Nd, n=1; RE=Dy, Er, Yb, n=3), is given. These were characterized by IR, UV-Visible, 1H NMR, 13C NMR and fluorescence. The results show that the schiff base is a tridentate ligand,and the rare earth ions exhibit a coordination of eight in the complexes. In visible spectra, the supersensitive transitions of the Er complex at 522 nm (4I15/2→2H11/2, 4S3/2) and that of the Nd complex at 573, 584 nm (4I9/2→2G7/2+4G5/2) can be observed. Fluorescence of the complexes was produced principally by f-f transition of central ion RE3+, and the ligand has little influence on lightening role. The order of relative intensity of fluorescence of the complexes is ITb>ISm>IEu>IDy.
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Received: 2004-05-08
Accepted: 2004-08-28
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Corresponding Authors:
LI Jin-zhou
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Cite this article: |
LI Jin-zhou,YU Zhi-gang,AN Yu-mei, et al. Synthesis and Spectral Characterization of Rare Earth Complexes of Acylpyrazolone-β-Alanine[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(09): 1482-1485.
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https://www.gpxygpfx.com/EN/Y2005/V25/I09/1482 |
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