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 Cu2+ in a DMSO/H2O 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 Cu2+ concentration within the range of 2 similar to 14 mu mol center dot L-1, with a detection limit of 39 nmol center dot L-1 and a binding constant of 1.56x10(3) L mol(-1). Additionally, the detection limit of the NS-Cu2+ complex for EDTA was calculated to be 187 nmol center dot L-1. NS also displayed promising applications in the environmental and alcoholic drinks for detecting Cu2+ in water, wine, and Chinese Baijiu samples.