title: A turn-on fluorescent probe for selective and sensitive detection of hydrogen sulfide.
abstract: An imidazolethione based turn-on fluorescent probe was synthesized for the detection of hydrogen sulfide, a biologically relevant molecule and an important air pollutant. The probe rapidly and selectively reacted with hydrogen sulfide to produce a strongly fluorescent product, resulting in the fluorescence enhancement of the system. The detection limit was determined to be 30 nM at the probe concentration of 1.0 μM. An indicating paper for visual detection of hydrogen sulfide gas has been fabricated by immobilizing the probe on a piece of appropriate paper substrate, and the detection limit of the visual method reached as low as 0.7 ppm. Moreover, the fluorescence turn-on/off of the system showed good reversibility when exposed alternately to hydrogen sulfide and mercuric ion, which was utilized to make an INHIBIT logic circuit for the presence of the two species.
authors.affiliation: Department of Chemistry, University of Science & Technology of China, Hefei, Anhui, China; Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Ma
authors.affiliation: Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui, China.
authors.forename: Mingtai
authors.initials: M
authors.lastname: Sun
authors.affiliation: Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui, China.
authors.forename: Kui
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui, China.
authors.forename: Huan
authors.initials: H
authors.lastname: Yu
authors.affiliation: Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui, China. Electronic address: zywang@iim.ac.cn.
authors.forename: Zhenyang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Chemistry, University of Science & Technology of China, Hefei, Anhui, China; Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui, China. Electronic address: shwang@iim.ac.cn.
authors.forename: Suhua
authors.initials: S
authors.lastname: Wang
mesh_terms: D005453:Fluorescence; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D006862:Hydrogen Sulfide / Q000032:analysis*; D007093:Imidazoles / Q000138:chemical synthesis / Q000737:chemistry; D057230:Limit of Detection; D013050:Spectrometry, Fluorescence / Q000379:methods; D013871:Thiones / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D005456:Fluorescent Dyes; D007093:Imidazoles; D013871:Thiones; D006862:Hydrogen Sulfide
keywords: Chemosensor; Displacement; Fluorescence turn-on sensing; Hydrogen sulfide