Abstract
AbstractA new fluorescent probe, NPQ‐C, was synthesized. NPQ‐C was based on the naphthalimide derivatives and exhibited high selectivity and sensitivity for Cr3+ ions. As a Cr3+‐amplified fluorescent probe, Its fluorescence spectrum showed 5.5‐fold enhancement in the intensity of the signal at 500 nm on binding with the Cr3+. Based on the fluorescence titration spectra and Job's‐plot analysis, binding mode of NPQ‐C with Cr3+ was proposed. Fluorescence intensity was linear with concentration of Cr3+ cation in a range from 0 to 10 µmol·L−1. NPQ‐C was also sensitive for Cr3+. The detection limit was calculated to be 0.20 µmol·L−1 which indicated that NPQ‐C was sensitive to Cr3+.
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