A highly sensitive naphthalimide‐based fluorescent probe for detection of Cu2+ via selective hydrolysis reaction and its application in practical samples. Issue 6 (12th December 2019)

• Record Type: Journal Article
• Authors: Li, Xueyun; Guo, Yifan; Xu, Tingting; Fang, Min; Xu, Qianwen; Zhang, Fan; Wu, Zhenyu; Li, Cun; Zhu, Weiju
• Is Part Of: Journal of the Chinese Chemical Society. Volume 67:Issue 6(2020)
• Page Start: 1070
• Page End: 1077
• Publication Date: 2019-12-12
• Subjects: copper ion (Cu2+) -- fluorescent probe -- hydrolysis -- naphthalimide derivative; Chemistry -- Periodicals; Electronic journals; 540.5
• DOI: 10.1002/jccs.201900315
• Languages: English
• ISSNs: 0009-4536

Abstract

Abstract : 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. Abstract : A novel naphthalimide‐based picolinate derivative CN3 was obtained for the detection of Cu27+ with high sensitivity. CN3 could beused for naked‐eye detection of Cu2+ in aqueous media. CN3 could be used to detect Cu2+ in real watersamples.