Dissertation > Excellent graduate degree dissertation topics show

Mercury Probes Based on Optical Information Changes of Hemicyanime and Rhodamine Deravitives

Author: LiYuanYuan
Tutor: ZengXianShun
School: Tianjin University of Technology
Course: Condensed Matter Physics
Keywords: Rhodamine 6G Hemicyanine Selenium Sulfur Mercury ion
CLC: O657.3
Type: Master's thesis
Year: 2011
Downloads: 90
Quote: 0
Read: Download Dissertation

Abstract


In recent years, environmental pollution caused by heavy metals is more and more serious. The development of highly selective fluorescent probes based on the theories of host-guest chemistry for metal ions detection is particularly important, since some metal ions can have extremely harmful effects on humans and the environment.This thesis developed a series of fluorescent probes （La-Lf） based on the fluorescent dyes of rhodamine 6G and hemicyanine as signal reporting groups. Their molecular recognition behaviours and molecular recognition mechanisms were evaluated detailly by UV-Vis absorption spectra and fluorescence spectra. The main contents are as follows:（a） Novel Hg2+-selective fluorescent probes （La-Ld） with hemicyanine as fluorescent reporting group and NSe2 chelating unit as ion binding site were synthesized and characterized. Fluorescent probes La and Lb show a specific Hg2+ selectivity to discriminate between Hg2+ and chemically close ions in junction with a visible colorimetric change from red to colorless, leading to potential production of both“naked-eye”and fluorometric detection of Hg2+ cations both in ethanol/water （v/v, 1:1） and water solutions. The detection limits are estimated to be l×10-7 M for La and 5.0×10-8 M for Lb, indicating that the limit of detection of Lb to Hg2+ met the discharge limit for industrial waste water according to China SA standard, or the U.S. EPA standard. Therefore, probe Lb can be used in practical waste water of industry to inspect and monitor mercury ions. Compared with probes La and Lb, only Ld has significant UV selectivity for Hg2+ in acetonitrile/water （v/v, 1:1） even though a slightly structural differences by replacement of the hydroxylethyl with phenyl in both Lc and Ld. In addition, in order to explore the possibility of compounds La-Ld as practical probes, the spectral changes of compounds L and L?Hg2+ are investigated at different pH value. The spectra of La?Hg2+, Lb?Hg2+ and Ld?Hg2+ are not sensitive within a wide range of pH value, indicating that these chemosensors can be used as colorimetric and fluorometric sensors in real samples.（b） Novel Hg2+-selective fluorescent probes （Le and Lf） with rhodamine 6G as fluorescent signal reporter were synthesized and characterized. Le and Lf have good selectivity and sensitivity for Hg2+ both in ethanol/water （v/v, 1:1） and water solutions. In the presence of Hg2+, the resulted Le solution exhibited an obvious and characteristic color change from colorless to rose, the color of Lf solution changed from colorless to light pink. The detection limits are estimated to be 5×10-8 M for Le and 2.0×10-8 M for Lf, indicating that the limits of detection of Le and Lf to Hg2+ met the discharge limit for industrial waste water. Therefore, probes Le and Lf can be used in practical waste water of industry to inspect and monitor mercury ions.

Related Dissertations

  1. Research on Influnce of Silicon and Sulfur on Arsenic Uptake and Accumulation of Rice (Oryza Sativa L.),S511
  2. Recovery Sulphur from Zinc Concentrate of Pressure Acid Leaching Residue,X751
  3. The Research on the Microwave Stability of Selenium-Enriched Rich Bram,TS210.9
  4. Exploration of Soil and Crop Selenium for Development of Se-Rich Produce in Ruian, ZheJiang Province,S153
  5. The Molecular Mechanism Intervention of Selenium on the Learning and Memory Injury by Drinking Water Fluorosis,R599
  6. The Study on Breeding and Fermentation Conditions of a Selenium-Riched Yeast and Its Application Research,TS201.25
  7. Process Selenuum Enriched Flos Chrysanthemi and Its Antioxidative Activity,S682.11
  8. Autoimmune thyroiditis efficacy of early intervention selenium,R581
  9. Rat hepatoma evolution of three biochemical factors and related drugs Intervention,R735.7
  10. Studies on the Influence of Selenium and Vitamin C on Oxidative Stress, DNA Damage and Bcl-2 Protein Expression Induced by High Fluoride,R599
  11. The Research on Enriched Selenium Pear Vinegar,TS264.22
  12. Study on the Pollutant Emission Characteristics of Biomass Combustion,TK6
  13. The diesel Biodesulfurization of Isolation and characterization of bacteria,X701.3
  14. Studies on Grifolan and Enriched Organic Selenium from Grifola Frondosa Liquid Cultured in Rice Bran Substrate,S646
  15. Studies on Submerged Fermentation Culture and Hypoglycemic Activity of Selenium-enriched Mycelia of Coprinus Comatus,S567.39
  16. Preliminary Function Analysis for Selenoprotein W in Chicken Skeletal Muscle and Its Response to Selenium,S831.5
  17. Anti-Oxidation Effects of Se-containing Polysaccharide SeGLP-2B-1 on Apoptosis of Breast Cancer MCF-7 Cells,R285.5
  18. Lead matte alkaline pressure leaching solution enriched selenium process,TQ125.2
  19. Studies on the Mechanism of Substrate Channeling in Sulfate Activating Complex of Rhodobacter Sphaeroides,Q936
  20. Identification and Functional Analysis of a Regulatory Protein for the petⅡ Operon in Acidithiobacillus Ferrooxidans,Q936

CLC: > Mathematical sciences and chemical > Chemistry > Analytical Chemistry > Instrument analysis ( physics and physical chemistry ) > Photochemical analysis ( spectral analysis method)
© 2012 www.DissertationTopic.Net  Mobile