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Syntheses and Luminescence Properties of Rare-erath Complexes with 2-substituted Succinicacid

Author: OuYangTao
Tutor: LiuShengLi
School: Hunan University of Science and Technology
Course: Chemistry
Keywords: Europium complexes Terbium complexes Substituent effects Chiral Fluorescence
CLC: O627.3
Type: Master's thesis
Year: 2011
Downloads: 36
Quote: 1
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Abstract


Paper were succinate (L 1 ), 2 - methyl succinate (L 2 ), 2 - methylene succinic acid (L 3 ), 2 - mercapto butyric acid (L 4 ), 2 - bromo-butyric acid (L 5 ), 2 - hydroxy acid (L 6 ), L 2 - hydroxy acid (L 7 ), D 2 - hydroxy acid (L 8 ) for the first ligand phenanthroline (phen), 2,2 '- bipyridine (bipy) as the second ligand synthesized 11 series of europium and terbium binary or ternary complexes. By elemental analysis, thermogravimetry - differential thermal analysis and coordination titration to determine the composition of binary complexes Ln 2 (L) 3 · 4H 2 O (Ln = Tb, Eu; L = succinic acid and its derivatives), consisting of ternary complexes Ln 2 (L) 3 M · 2H 2 O (M = phen, bipy). By infrared spectroscopy, fluorescence spectroscopy study of the nature of each series of complexes. The complexes fluorescence analysis, the results showed that: (1) the first ligand and the second ligand-sensitized luminescence of rare earth ions have the best ratio. Different metal ions, different systems are not exactly the same as the best ratio; (2) the introduction of the second ligand greatly enhanced Tb (Ⅲ) and Eu (Ⅲ) Complexes of luminous intensity. (3) substituted ligand complexes of changes in the fluorescence excitation and emission peaks peak position changes little effect, but the fluorescence intensity of the complexes have a greater impact. In different systems the change of substituents in the fluorescence properties of the complexes is not exactly the same, but the results show that the fluorescence intensity of complexes with the ligand basic or electron donating substituents enhance the ability of the enhancement. (4) chiral ligand complexes fluorescence properties have a greater impact, according to the experimental data we find two kinds of chiral ligand complexes fluorescence intensity is roughly equal, but should be significantly stronger than the racemic ligand complex Fluorescence intensity. Introduction of gadolinium, terbium and yttrium rare earth doped synthetic complexes (Tb: Gd / Y = 10:0 ~ 0:10), and tested the fluorescent properties of complexes. Found Tb doped metal ion molar ratio of 7:3 complexes maximum fluorescence intensity. In the previous experiments based on the optimization of an optimal ratio, the introduction of yttrium as a doping metal ions, phen ligands were synthesized for the second of four yuan Terbium complexes. Characterization of the nature of the complexes and compared the binary, ternary and quaternary complexes fluorescence properties found quaternary complex is slightly larger than the fluorescence intensity of ternary complexes, but much larger than the binary complex.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Elements in organic compounds > The first III group elements, organic compounds
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