A comparison of sensitized Ln(III) emission using pyridine- and pyrazine-2,6-dicarboxylates

The synthesis, X-ray structure, solution stability, and photophysical properties of Eu(III) complexes with pyrazine-2,6-dicarboxylic acid (H(2)PYZ) are reported, and compared to structurally analogous complexes with pyridine-2,6-dicarboxylic acid (H(2)DPA). The [Eu(PYZ)(3)](3-) complex demonstrates...

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Veröffentlicht in:Dalton transactions : an international journal of inorganic chemistry 2012-05, Vol.41 (17), p.5272-5279
1. Verfasser: Moore, Evan G
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description The synthesis, X-ray structure, solution stability, and photophysical properties of Eu(III) complexes with pyrazine-2,6-dicarboxylic acid (H(2)PYZ) are reported, and compared to structurally analogous complexes with pyridine-2,6-dicarboxylic acid (H(2)DPA). The [Eu(PYZ)(3)](3-) complex demonstrates highly efficient metal-centered Eu(III) luminescence in the solid state (Φ(total) ∼ 60.9%). In aqueous solution, moderate stability is retained at pH 7.4 (pEu ∼ 10.5), although hydrolysis of the complex anion becomes competitive below mM concentrations, and the observed luminescence intensity from the Eu(III) metal ion is reduced as a result. A complete evaluation of the thermodynamic solution stability has allowed the observed differences in the solution behaviour luminescence properties of these complexes to be rationalized. An analysis of their luminescence behaviour in the solid state has also allowed a direct comparison of the sensitisation behaviour for these isostructural compounds.
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The [Eu(PYZ)(3)](3-) complex demonstrates highly efficient metal-centered Eu(III) luminescence in the solid state (Φ(total) ∼ 60.9%). In aqueous solution, moderate stability is retained at pH 7.4 (pEu ∼ 10.5), although hydrolysis of the complex anion becomes competitive below mM concentrations, and the observed luminescence intensity from the Eu(III) metal ion is reduced as a result. A complete evaluation of the thermodynamic solution stability has allowed the observed differences in the solution behaviour luminescence properties of these complexes to be rationalized. 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ispartof Dalton transactions : an international journal of inorganic chemistry, 2012-05, Vol.41 (17), p.5272-5279
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source MEDLINE; Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection
subjects Aqueous solutions
Carboxylic Acids - chemistry
Emission
Europium - chemistry
Hydrogen-Ion Concentration
Hydrolysis
Luminescence
Luminescent Measurements
Models, Molecular
Molecular Conformation
Organometallic Compounds - chemical synthesis
Organometallic Compounds - chemistry
Pyrazines - chemistry
Pyridines - chemistry
Solid state
Stability
Synthesis
Water - chemistry
X-rays
title A comparison of sensitized Ln(III) emission using pyridine- and pyrazine-2,6-dicarboxylates
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