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Synthesis, Characterization and Studies on Fluorescence Properties of Rare Earth with Halogen-benzoic Acid and 2, 4, 6-tris-(2-pyridyl)-s-triazine

Author: ZhouYongSheng
Tutor: ZhaoYongLiang
School: Inner Mongolia University
Course: Inorganic Chemistry
Keywords: Halogenated benzoic acid 2,4,6 - pyridyl triazine Europium doped complexes Terbium -doped complexes Fluorescence Properties
CLC: O627.3
Type: Master's thesis
Year: 2009
Downloads: 78
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Abstract


Halogenated benzoic first ligand and the 2,4,6 - pyridyl triazine (TPTZ) for the second ligand, Sm, Eu, Tb, and Dy as central ion twelve kinds of synthesized mononuclear rare earth ternary complexes of europium, terbium, dysprosium, lanthanum, yttrium, 20 gadolinium A the heteronuclear rare earth complexes. Rare earth titration by elemental analysis, inductively coupled plasma atomic emission spectrometry (ICP) determination and differential thermal - thermal gravimetric analysis, that the composition of the mononuclear complexes: RE (P-ClBA) 3 ( TPTZ) · 2H 2 O; RE (P-BrBA) 3 (TPTZ) · 2H 2 O; RE (P-IBA) < sub> 3 (TPTZ) · 2H 2 O (RE = Sm, Eu, Tb, Dy); composition of the heteronuclear europium complexes: Eu 0.5 Ln 0.5 (P-ClBA) 3 (TPTZ) · 2H 2 O; Eu 0.5 Ln 0.5 (P-BrBA) 3 (TPTZ) · 2H 2 O; Eu 0.5 Ln 0.5 (P-IBA) 3 (TPTZ) · 2H 2 O (Ln = La, Y, Gd); the heteronuclear terbium composition of the complexes: Tb < sub> 0.5 Ln 0.5 (P-ClBA) 3 (TPTZ) · 2H 2 O; Tb 0.5 < / sub> Ln 0.5 (P-BrBA) 3 (TPTZ) · 2H 2 O; Tb 0.5 Ln heteronuclear dysprosium complexes 0.5 (P-IBA) 3 (TPTZ) · 2H 2 O (Ln = La, Y, Gd); composition: Dy 0.5 Gd 0.5 (P-ClBA) 3 (TPTZ) · 2H 2 O; Dy 0.5 Gd 0.5 (P-BrBA) 3 (TPTZ) · 2H 2 O; Dy 0.5 Gd 0.5 (P-IBA) 3 (TPTZ) · 2H 2 O. The molar conductivity that all complexes are non-electrolytes; infrared spectroscopy and NMR showed that the halogenated benzoic acid carboxyl group with the metal ion symmetrically chelating bidentate 2,4,6 - pyridyl triazine coordinated to three nitrogen atoms in the main coordination point with rare earth ions. The fluorescence spectra and fluorescence lifetime measurement, the europium the Series complexes of strong fluorescence lifetime in the complex of terbium series; different nuclear lanthanum-doped rare earth complexes fluorescence lifetime is stronger than the mononuclear lanthanide complexes, ligand triplet level Eu < sup> 3 , the Tb 3 of the lowest excited state energy levels match better. In addition, to further discuss the ligand and dopant ions on the fluorescence properties of rare earth complexes.

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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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