Novel ligands, diethylenetriaminepentaacetic acid bearing several aromatic amines, were synthesized and their chelates with a europium ion were prepared. The lanthanide luminescence of the chelates of 1-aminonaphthalene and 7-amino-4-methylcoumarin was largely enhanced by the energy transfer from the ligand to the europium ion.
Long‐lived ratiometric sensors: Luminescentlanthanidecomplexes are widely used in time‐resolved assays of biomolecules, but most of the sensors with these complexes rely on single‐point intensity measurements. Herein, we introduce a simple strategy to create ratiometricprobes by using salicylic‐acidderivatives as the antenna moiety of Tb3+ complexes. As an example, a probe for alkaline phosphatase