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A highly sensitive naphthalimide‐based fluorescent probe for detection of Cu 2+ via selective hydrolysis reaction and its application in practical samples
Author(s) -
Li Xueyun,
Guo Yifan,
Xu Tingting,
Fang Min,
Xu Qianwen,
Zhang Fan,
Wu Zhenyu,
Li Cun,
Zhu Weiju
Publication year - 2020
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201900315
Subject(s) - chemistry , fluorescence , detection limit , hydrolysis , mass spectrometry , quenching (fluorescence) , nuclear chemistry , proton nmr , nuclear magnetic resonance spectroscopy , fluorescence spectroscopy , spectroscopy , buffer solution , analytical chemistry (journal) , photochemistry , inorganic chemistry , chromatography , organic chemistry , physics , quantum mechanics
A novel fluorescent probe CN3, containing 1,8‐naphthalimide and picolinate units, was synthesized, and its structure was characterized by 1 H nuclear magnetic resonance spectroscopy (H NMR), 13 C nuclear magnetic resonance spectroscopy (C NMR), and mass spectroscopy techniques. The detection property of CN3 toward copper ions (Cu 2+ ) has been investigated in ethanol–HEPES buffer (v/v = 1/1, pH = 7.40) solution by UV–Vis absorption and fluorescence emission spectra. The results showed that CN3 had a highly selective and sensitive fluorescence quenching response to Cu 2+ , which was attributed to the generation of weak fluorescent N‐ethyl‐4‐hydroxyphenyl‐1,8‐ naphthalimide (compound 2) in polar ethanol–HEPES buffer (v/v = 1/1, pH = 7.40) via selective hydrolysis reaction. The detection of CN3 for Cu 2+ was not influenced in the presence of other competing metal ions, and the limit of detection was as low as 50.0 nM. Therefore, the color of CN3 changed from colorless to yellowish when the Cu 2+ was added. Furthermore, the fluorescent probe CN3 was utilized to detect Cu 2+ in real water samples with fine performance.