科研之友
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摘要
The luminescence properties, lifetimes and quantum yields of lanthanide (Ln) complexes of various ligands bearing 6-carboxy-2-pyrazolyl-pyridin or 6-carboxy-2,2-bipyridine subunits have been measured in aqueous solutions. Wrapping of three negatively charged bipyridine carboxylate grafted on a triazacyclononane macrocycle afforded very stable complexes where the Eu and Tb are efficiently shielded from the surrounding solvent molecules with excited state lifetimes of 1.85 and 0.50 ms and quantum yields of 12 and 10%, respectively for Eu and Tb. While saturation of the first co-ordination sphere gave highly luminescent complexes, the engineering of complexes with open sites in the first co-ordination sphere of the metal allows for the detection of various anions with modulation of the luminescence properties. The recognition processes have been studied by means of varying spectroscopic methods and the overall mechanistic aspect of this work rationalised with the help of molecular dynamic simulation.
- 出版日期2004-7-14
