title: Highly selective and sensitive chemosensor for Hg2+ based on the naphthalimide fluorophore.
abstract: A new OFF-ON fluorescent chemosensor (H1) composed of a naphthalimide fluorophore and a 6-[(quinolin-8-yloxy)methyl]pyridin-2-ylmethanamine receptor has been synthesized and characterized by infra-red, (1)H NMR, (13)C NMR and mass spectrometry. The developed chemosensor H1 exhibited good turn-on and reversible responses toward Hg(2+), with excellent selectivity and sensitivity, in a neutral buffered aqueous solution. Other common metal ions did not interfere with the fluorescence-enhancement response to Hg(2+). Furthermore, the chemosensor H1, at a concentration of 10 μM, showed a rapid and linear response toward Hg(2+) in the concentration range 0-10 μM. On addition of 10 μM Hg(2+), the fluorescence intensity of H1 was enhanced about 4-fold. The detection limit was calculated to be 63 nM. The association constant was 1.11 × 10(5) M(-1). The fluorescence quantum yield and lifetime of H1/Hg(2+) were 0.42 and 3.83 ns, respectively.
authors.affiliation: Key Laboratory of Fine Chemicals, College of Heilongjiang Province, Qiqihar University, No. 42 Wenhua Street, 161006, Qiqihar, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Yang
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Guo
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Lihua
authors.initials: L
authors.lastname: Jia
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D004579:Electron Transport; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D053644:Naphthalimides / Q000737:chemistry*; D055668:Photochemical Processes; D013050:Spectrometry, Fluorescence; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D005456:Fluorescent Dyes; D053644:Naphthalimides; D014867:Water; D008628:Mercury