Determination of Mercury(II) in Aquatic Plants Using Quinoline–Thiourea Conjugates as a Fluorescent Probe

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  • FENG Guodong
    Department of Analytical Chemistry, College of Chemistry, Jilin University
  • DING Yuanyuan
    Department of Analytical Chemistry, College of Chemistry, Jilin University
  • GONG Zhiyong
    Department of Analytical Chemistry, College of Chemistry, Jilin University
  • DAI Yanna
    Department of Analytical Chemistry, College of Chemistry, Jilin University
  • FEI Qiang
    Department of Analytical Chemistry, College of Chemistry, Jilin University

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In this study, a quinoline–thiourea conjugate (1-phenyl-3-(quinoline-8-yl) thiourea, PQT) was synthesized and used as a fluorescence sensor to detect mercury ion. The observation is coincident with the well-documented phenomenon that a thiocarbonyl-containing group on a fluorochrome quenches the fluorescence due to the heavy atom effect of the S atom. The large fluorescence enhancement of PQT in the buffered MeCN–water mixture (1/1 v/v; HEPES 100 mM; pH 8.0) was caused by the Hg2+ induced transformation of the thiourea function into a urea group. As such, protic solvents can be ascribed to hydrogen bond formation on the carbonyl oxygen to reduce the internal conversion rate. The fluorescence intensity of PQT was enhanced quantitatively with an increase in the concentration of mercury ion. The limit of detection of Hg2+ was 7.5 nM. The coexistence of other metal ions with mercury had no obvious influence on the detection of mercury. A quinolone–thiourea conjugate was used as a fluorescent probe to detect Hg2+ in aquatic plants and the experimental results were satisfactory.

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  • Analytical Sciences

    Analytical Sciences 29 (7), 735-740, 2013

    社団法人 日本分析化学会

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