A dual‐function chemosensor based on coumarin for fluorescent turn‐on recognition of Hg2+ and colorimetric detection of Cu2+ in aqueous media. Issue 2 (18th July 2019)

• Record Type: Journal Article
• Authors: Xu, Peipei; Liu, Xiaonan; Zhao, Xin; Zhu, Weiju; Fang, Min; Wu, Zhenyu; Du, Longchao; Li, Cun
• Is Part Of: Journal of the Chinese Chemical Society. Volume 67:Issue 2(2020)
• Page Start: 298
• Page End: 305
• Publication Date: 2019-07-18
• Subjects: Coumarin derivative -- Cu2+ -- dual‐function chemosensor -- Hg2+; Chemistry -- Periodicals; Electronic journals; 540.5
• DOI: 10.1002/jccs.201900188
• Languages: English
• ISSNs: 0009-4536

Abstract

Abstract : A novel coumarin derivative CTT was synthesized via the condensation of 7‐( N, N ‐diethylamino) coumarin‐3‐aldehyde with 5‐amino‐1, 3, 4‐thiadiazole‐2‐thiol and its structure was characterized using infrared spectroscopy (IR), 1 H NMR, mass spectrometry (MS) techniques, and elemental analysis. The recognition properties of CTT with metal ions were investigated in CH3 CN–H2 O (v/v = 1/1) solution using UV–vis absorption and fluorescence emission spectrum method. The results showed that CTT could monitor Cu 2+ and Hg 2+ simultaneously as a dual‐function chemosensor in CH3 CN–H2 O (v/v = 1/1). CTT could be used to detect Cu 2+ colorimetrically; when using CTT, a color change from yellowish‐brown to yellowish‐green could be readily observed by the naked eye. CTT showed turn‐on fluorescent recognition of Hg 2+, the fluorescence enhancement was attributed to the inhibited C=N isomerization and the obstructed excited state intramolecular proton transfer (ESIPT) of CTT. The recognition mechanism of CTT for Cu 2+ and Hg 2+ was studied by experiments and theoretical calculations, respectively. Therefore, CTT has the ability to be a "single chemosensor for dual targets." Abstract : A novel simple and easily synthesized based on coumarin Schiff base derivative CTT was obtained for the detection of Cu2+ and Hg2+ simultaneously. CTT could be used for visual detection of Cu2+ by the naked eye in aqueous media. CTT could be used for turn‐on fluorescent detection of Hg2+ by in aqueous media.