Dissertation > Excellent graduate degree dissertation topics show

Fluorescent Enhancement of Guest Molecules by Supramolecular Hydrogel

Author: LiXue
Tutor: WangHong
School: Huazhong University of Science and Technology
Course: Analytical Chemistry
Keywords: Supramolecular hydrogels Fluorescence enhancement Eu (Ⅲ) Tb-PUFX Fluoride ion response Hydrogen ion response
CLC: O648.17
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 0
Read: Download Dissertation

Abstract


Supramolecular gel is gathered by gel factor assembled to form a three-dimensional network structure of the quasi-solid, this unique structure makes the guest fluorescent molecules in which unlike in the solution exhibits fluorescence behavior. This paper studies the supramolecular hydrogels formed by gelator benzoyl cystine (N, N-dibenzoyl-L-cystine, DBC) of rare earth ions Eu (III) of fluorescent enhance the role and mechanism; then the supramolecular hydrogels formed by the gelator Dibenzylidene sorbitol (1,3:2,4-di-O-benzylidene-D-sorbotol, DBS) terbium - prulifloxacin complex ( Tb-PUFX) fluorescence enhancement; DBC supramolecular hydrogel final study the response characteristics of fluoride ions and hydrogen ions. The results are as follows: 1, Eu (Ⅲ) DBC gel fluorescence intensity than its solution greatly enhanced. Variable temperature fluorescence spectra showed that Eu (Ⅲ) DBC gel fluorescence enhancement heat reversible; time-resolved fluorescence fluorescence lifetime of Eu (Ⅲ) in the gel state above solution. The presence of Eu (III) of significantly improved gel phase transition temperature, field emission scanning electron micrograph of Eu (III) of the DBC aggregates more compact three-dimensional network structure. UV spectra and infrared spectra show that the Eu (Ⅲ) with DBC molecules interact to form Eu (Ⅲ) complexes. The above results show that the complexation of Eu (Ⅲ) with DBC aggregates induced fluorescence enhancement of Eu (Ⅲ) DBC gel. 2, the steady-state fluorescence spectra showed that DBS supramolecular hydrogels can be increased or sensitive of Tb-PUFX the fluorescence. The fluorescence Photo Show the Tb-PUFX supramolecular hydrogels evenly distributed. Variable temperature fluorescence spectra improve, Tb-PUFX decrease in fluorescence intensity temperature, the lower the temperature, the fluorescence enhancement, indicating that DBS heat reversible gel of the Tb-PUFX fluorescence sensitizing. The time-resolved fluorescence Show the Tb-PUFX fluorescence decay rate in the gel is less than the decay rate of fluorescence of the solution state. The reasons the Tb-PUFX DBS gel fluorescence enhancement of the DBS aggregates so the Tb-PUFX in the supramolecular gels movement speed slow down, reduce non-radiative transition probability of the collisional quenching. Phenanthroline ruthenium (II) complexes (Ru (Phen) 3 Cl 2 ) as a fluorescent probe to study the DBC gel F-and H response. The results showed that Ru (Phen) 3, DBC gel Cl 2 fluorescence intensity with increasing concentration of F-reduced with H concentration increases, the phase transition temperature is also changed, the display DBC gel such response characteristic is due to F-can destroy the hydrogen bonds between the DBC aggregates on the F-and H response; and the degree of H concentration affect the solution of the carboxyl group on the DBC molecular structure from the due.

Related Dissertations

  1. Spectral and Electrochemical Research of Epirubicin Hydrochloride with Its Analytical Application,TQ465
  2. Synthesis and Responsive Behavior of Amphiphilic Azobenzene Functionalized Block Copolymers,O631.3
  3. Adsorption of Eu (Ⅲ) and Cu (Ⅱ) on Multi-walled Carbon Nanotubes,TB383.1
  4. Study on the Interaction of Drug and Protein Xiaoyan Gao (Analysis Chemistry),R96
  5. Design and Synthesis of Cu2+ Receptors for Recognition,O641.4
  6. Adsorption of Eu(Ⅲ) on Bentonite and Montmorillonite,O647.3
  7. Adsorption of U（Ⅵ）、Th（Ⅳ） and Eu（Ⅲ） on γ-Al2O3,O647.31
  8. Micelles as "Fluorescence Protector" for Rare Earth Complexes in Microcapsules,O641.4
  9. Design, Synthesis and Mechanism Study of Fluorescence Sensors Based on Schiff Base for Zinc Ions,O641.4
  10. Study on the Sorption of Am（Ⅲ） and Eu（Ⅲ） onto TiO2 and Al2O3,O647.31
  11. The new bimetallic heteronuclear europium ( III ) complexes Synthesis and Luminescence Properties,O641.4
  12. Studies on the Synthesis and Photo, Electro-luminescence Property of the Novel Rare Earth Complexes,O641.4
  13. Synthesis and Characterization of Methyl-Phenacyl Sulfoxide Complexes with Rare Earth Perchlorate and Studies on Fluorescence Spectra of Complexes,O641.4
  14. Study on Detection Technology for Determination of Aflatoxin B1 with High Sensitivity,TS207.4
  15. Photo-Assisted Photoluminescent Enhancement of Water-Soluble CdTe Nanocrystals,O614.242
  16. Construction and Optical Properties of Low Molecular Weight Organogelator with Fluorescence Emission Enhancement Induced by Aggregation,O621.2
  17. The Fabrication and Modification of Microstructured Polymer Optical Fiber and Its Application in the Field of Chemical Sensing,TN253
  18. Indole squarylium dyes, semi- synthetic dyes and applied research,TQ613.5
  19. Supramolecular Recognition and Signaling Based on Argentophilic Metal Coordination Polymers and Ⅱ-Ⅵ Group Semiconductor Photoluminescent Nanocrystals,O641.4
  20. Conversion and fluorescent effect on the frequency of the rare-earth -doped fluoride,O482.31

CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Colloid chemistry ( physical and chemical dispersion system ) > Colloid > Gel and soft
© 2012 www.DissertationTopic.Net  Mobile