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Nucleophilic Addition‐Triggered Lanthanide Luminescence Allows Detection of Amines by Eu(thenoyltrifluoroacetone)3

Herein, a novel fluorescent indicator for the real‐time monitoring of amines is described. This probe contains a complex of europium‐(thenoyltrifluoroacetone)3 (Eu(TTA)3) that efficiently reacts with primary and secondary amines. The electron‐withdrawing trifluoroacetyl undergoes a nucleophilic addition with amines, and the complex was used to selectively detect BuNH2 and Et2NH (quenching concentration for BuNH2: 10−4 m, for Et2NH: 1.2 × 10−3 m) by monitoring emission; no changes were observed in the emission spectrum of Eu(TTA)3 in the presence of Et3N, [Bu4N]Cl, or PhNH2 in aqueous solution (THF/H2O = 1:1). The ratio of emission intensity to amine concentration was linear by the least‐squares fitting method.