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Study on Supramolecular Fluorescence Probes of Cyclodextrin-Hydroxylanthraquinone

Author: WangLei
Tutor: WangZuo
School: Shanxi University
Course: Analytical Chemistry
Keywords: Hydroxyanthraquinones Cyclodextrins Supramolecularcomplex Fluorescence determination
CLC: O621.3
Type: Master's thesis
Year: 2012
Downloads: 71
Quote: 0
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Abstract


Chapter1:The concept of supramolecular chemistry, the structural features of cyclodextrins as well as the research progress on the applications of cyclodextrin-based supramolecular systems were briefly introduced. Analytical methods for the determination of anthraquinones and the applications of anthraquinones to the determination of ions were also reviewed.Chapter2:Interaction of1,4-Dihydroxyanthraquinone(1,4-DHAQ) with β-cyclodextrin was studied using UV-Vis absorption spectroscopy as well as fluorescence spectroscopy.1,4-DHAQ formed a1:1stoichiometry inclusion complex with β-CD and the formation constant was calculated to be5.66×104M-1. The1,4-DHAQ-β-CD supramolecular complex was used for the spectroscopic determination of Cu2+ions in aqueous solution with high selectivity. The fluorescence response was concentration-dependent and can be well described by the modified Stern-Volmer model. An easily applied method for Cu2+determination in an aqueous medium was thus established. Under the optimum conditions, the method exhibits a dynamic response range for Cu2+from2.0×10-7to2.0×10-6M, with a detection limit of7×10-8molL-1.Chapter3:1,8-Dihydroxyanthraquinone(DHAQ) can form an inclusion complex with β-cyclodextrin(β-CD) in aqueous media, which can be employed to solubilize and stabilize the DHAQ in water. With the assistance of ammonia, the supramolecular DHAQ-β-CD complex showed a selective chromogenic behavior toward Cu2+ions by changing the color of the solution from citrus red to purple red, which could be easily observed with the naked eye. Moreover, fluorescence emission of the system was selectively quenched by Cu2+ions. The fluorescence response was concentration-dependent and can be well described by the typical Stern-Volmer model. An easily applied method for Cu2+determination in an aqueous medium was thus established. Under the optimal conditions, the method exhibits a dynamic response range for Cu2-from8.0x10-7to2.0x10-5M, with a detection limit of2.7x10-7mol L-1. The proposed method was preliminarily applied in the determination of Cu2+in tap and polluted river water samples as well as in tea with satisfactory results.Chapter4:An easily applied method for VB12fluorimetric determination in an aqueous medium was established. VB12was found to have a quenching effect on the fluorescence intensity of the1,8-DHAQ-HP-β-CD supramolecular complex. The fluorescence responses were concentration-dependent, which can be used for the determination of VB12. Under the optimal conditions, there was a satisfactory linear relationship between F0-F and VB12concentration in the range of0to4.0x10-5mol/L. The detection limit of VB12is2.1xl0-6mol L-1.

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