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Synthesis And Ion Recognition Properties Of Fluorescent Organic Quantum Dots

Posted on:2011-12-10Degree:MasterType:Thesis
Country:ChinaCandidate:H J YanFull Text:PDF
GTID:2198360305468275Subject:Organic Chemistry
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Fluorescenct sensor (FS) has high sensitivity, low detection limition, can be real-time and on-line measurement of trace analysis, which has attracted great interest. Most of the current works focus on FSs based on organic molecules and semiconductor quantum dots (QDs). However, they exhibit some limitation, such as photobleaching, poor water solubility, and have to be further modified. In order to solve these problems, as a consequence of the multifunctionality, designability and tailorability of small organic materials, combine with size effect of QDs, which can obtain fluorescenct organic quantum dots (FOQDs) with novel optical, electrical, catalytic and other characteristics. In the paper, a new series of FOQDs with good water solubility and their own rich organic functional groups were synthesized by a simple reprecipitation method, and further realized in the application of fluorescenct detection.1.A novel fluorescenct organic quantum dots based on thiourea-thiadiazole-pyridine linked (TTP) molecule were designed and synthesized. It might be the first ratiometric and water-soluble fluorescent measurement of Hg2+ with high selectivity and sensitivity and also developed the applications of nanotechnology in chemosensor chemistry.2.On the basis of the preceding chapter, a strategy for MB-target binding readout using a separated molecular recognition element and signal reporter had been reported. This approach to detect DNA hybridization based on a TTP FOQDs fluorescence stock's shift was only the primary study. Further investigation was in progress in our laboratory to improve selectivity and sensitivity of the organic quantum dots.3.A new urea-thiadiazole-benzene derivative (UTB) fluorescent anion receptor was designed, which exhibited aggregation-induced emission enhancement (AIEE) characteristics. UTB FOQDs were also prepared as a HCO3- sensor with highly selective and sensitive. Moreover, The possible mechanism had been studied.4.s-Triazolo-Thiadiazole (DTT) FOQDs were prepared with two-component recognition, which acted as potential primary sensor toward Ag+ by switch-on fluorescence and was a secondary sensor toward Cys. The method was a basis for further two-component recognition study of DTT FOQDs.
Keywords/Search Tags:Fluorescenct organic quantum dots, aggregation-induced emission enhancement, Hg2+, DNA, HCO3-, Ag~+, Cys
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