Issue 17, 2012

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

Abstract

The synthesis, X-ray structure, solution stability, and photophysical properties of Eu(III) complexes with pyrazine-2,6-dicarboxylic acid (H2PYZ) are reported, and compared to structurally analogous complexes with pyridine-2,6-dicarboxylic acid (H2DPA). The [Eu(PYZ)3]3− complex demonstrates highly efficient metal-centered Eu(III) luminescence in the solid state (Φtotal ∼ 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.

Graphical abstract: A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates

Supplementary files

Article information

Article type
Paper
Submitted
10 Jan 2012
Accepted
10 Feb 2012
First published
10 Feb 2012

Dalton Trans., 2012,41, 5272-5279

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

E. G. Moore, Dalton Trans., 2012, 41, 5272 DOI: 10.1039/C2DT30062A

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