Abstract
A new fluorescent probe (TPIP) bearing triarylimidazole and pyridine moieties was synthesized and applied to the detection of Cu2+ with high sensitivity and selectivity. Upon the addition of Cu2+, the probe displayed an apparent dual-channel signal change of the UV–Vis absorption and fluorescence spectra, and the obvious color change from bright blue to colorless under a UV lamp was discernable to the naked eye. The sensing mechanism of the probe towards Cu2+ was verified to be via complexation, and the binding reaction was rapidly complete within 30 s. Good linearity was observed between the probe and Cu2+, and the detection limit was calculated to be 1.96 × 10−8 M. The reversibility of the probe was easily achieved by adding EDTA, which released the free probe with over 95% fluorescence recovery. Furthermore, the recognition of Cu2+ on TLC plates was realized, indicating the potential utility of the probe.
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