Comparative Study of the Luminescence Properties and Relative Stability of a Series of Europium(III) Complexes Bearing One to Four Coordinated Azaxanthone Groups
✍ Scribed by David Parker; James W. Walton; Laurent Lamarque; Jurriaan M. Zwier
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 265 KB
- Volume
- 2010
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Abstract
The synthesis and spectral properties are reported of a set of four europium(III) complexes containing between one and four 3‐azaxanthone sensitising chromophores. Each complex is based on a macrocyclic cyclen core. The emission and aqueous solution ^1^H NMR spectral properties are compared, revealing information about the local complex symmetry on the experimental timescale. A C~2~‐symmetric mono‐cationic complex shows an overall emission quantum yield of 10 % in HEPES buffer and exhibits the best relative stability profile in the presence of a million‐fold excess of added metal salts or EDTA, as indicated by the time‐dependence of overall europium emission, following indirect excitation of the 3‐azaxanthone chromophore.