Synthesis and Properties of a Triphenylamine‐Based Fluorescent Probe for the Continuous Detection of Cu²⁺ and EDTA

A fluorescent probe NS was successfully developed using triphenylamine aldehyde and 1‐hydroxy‐2‐naphthaldehyde. NS demonstrated selective recognition of Cu 2+ in a DMSO/H 2 O solution, forming a stable 1 : 1 complex that led to fluorescence quenching. The addition of EDTA resulted in fluorescence recovery. The fluorescent intensity of NS showed a linear correlation with Cu 2+ concentration within the range of 2~14 μmol ⋅ L −1 , with a detection limit of 39 nmol ⋅ L −1 and a binding constant of 1.56×10 3 L mol −1 . Additionally, the detection limit of the NS‐Cu 2+ complex for EDTA was calculated to be 187 nmol ⋅ L −1 . NS also displayed promising applications in the environmental and alcoholic drinks for detecting Cu 2+ in water, wine, and Chinese Baijiu samples.