title: A highly selective fluorescent sensor for mercury ion (II) based on azathia-crown ether possessing a dansyl moiety.
abstract: An intramolecular charge transfer (ICT) fluorescent sensor 1 using a dansyl moiety as the fluorophore and an azathia-crown ether as the receptor was designed, synthesized and characterized. The ions-selective signaling behaviors of the sensor 1 were investigated in CH(3) CN-H(2) O (1:1, v/v) by fluorescence spectroscopy. It exhibited remarkable fluorescence quenching upon addition of Hg(2+), which was attributed to the 1:1 complex formation between 1 and Hg(2+), while other selected metal ions induced basically no spectral changes. The sensor 1 showed a rapid and linear response towards Hg(2+) in the concentration range from 5.0 × 10(-7) to 1.0 × 10(-5) mol L(-1) with the detection limit of 1.0 × 10(-7) mol L(-1). Furthermore, the whole process could be carried out in a wide pH range of 2.0-8.0 and was not disturbed by other metal ions. Thus, the sensor 1 was used for practical determination of Hg(2+) in different water samples with satisfactory results.
authors.affiliation: College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China.
authors.forename: Huajun
authors.initials: H
authors.lastname: Dai
authors.forename: Fei
authors.initials: F
authors.lastname: Liu
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Gao
authors.forename: Tianhua
authors.initials: T
authors.lastname: Fu
authors.forename: Xingming
authors.initials: X
authors.lastname: Kou
mesh_terms: D043844:Crown Ethers / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D009682:Magnetic Resonance Spectroscopy; D008628:Mercury / Q000032:analysis*; D013050:Spectrometry, Fluorescence
chemical_list: D043844:Crown Ethers; D005456:Fluorescent Dyes; D008628:Mercury