[Synthesis and spectral characterization of rare earth complexes of acylpyrazolone-beta-alanine].
In non-aqueous solvent, a new amino-acid schiff base, 1-phenyl-3-methyl-4-benzoyl pyrazolone-5-beta-alanine (HL) was synthesized by a reaction of beta-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 (4 I15/2 -->2 H11/2, 4 S3/2 ) and that of the Nd complex at 573, 584 nm (4I9/2 -->2 G7/2 + 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.
Li
Jin-zhou
JZ
Department of Chemistry, Harbin Normal University, Harbin 150080, China.
Yu
Zhi-gang
ZG
An
Yu-mei
YM
Yang
Yu
Y
D000409:Alanine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D004419:Dysprosium / Q000737:chemistry; D005063:Europium / Q000737:chemistry; D005453:Fluorescence; D009682:Magnetic Resonance Spectroscopy; D008674:Metals, Rare Earth / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D047069:Pyrazolones / Q000737:chemistry*; D012493:Samarium / Q000737:chemistry; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013725:Terbium / Q000737:chemistry; D015091:beta-Alanine / Q000737:chemistry*
C550016:1-phenyl-3-methyl-4-benzoylpyrazolone-5-beta-alanine; D008674:Metals, Rare Earth; D009942:Organometallic Compounds; D047069:Pyrazolones; D012545:Schiff Bases; D013725:Terbium; D015091:beta-Alanine; D004419:Dysprosium; C038362:pyrazolone; D012493:Samarium; D005063:Europium; D000409:Alanine