Abstract
Sensitive biological analysis requires optical labels have good water solubility and excellent luminescent properties. Herein, two water-soluble lanthanide (Ln) complexes, Na 6[Ln(PTA) 3] (Ln = Eu and Tb), have been synthesized with a new tridentate ligand, pyridine-2,4,6-tricarboxylic acid (H 3PTA). The two-lanthanide complexes showed great characteristic emissions of Eu 3+ and Tb 3+ ions with high quantum yields of 54.3 ± 0.5% and 20.2 ± 0.2%, respectively. Moreover, they have good water solubility and can be labelled on biological molecules by dehydration reactions between the non-coordinated –COOH groups from the luminescent complexes and the –NH 2 groups from the biological molecules.
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