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Synthesis and Ion Recognition Properties Investigation of Fluorescent Sensor Based on Pyrazine Styrene

Author: CaoShengGen
Tutor: WuFangYing
School: Nanchang University
Course: Analytical Chemistry
Keywords: Pyrazine Fluorescent probes Fluorescence quantum yield molecularrecognition
CLC: O626
Type: Master's thesis
Year: 2012
Downloads: 64
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Abstract


Fluorescent Probes based on fluorescence detection have many merits, such as high sensitivity, selectivity,"on-off" and easy to operate. They have already played an important role in metallic ions, cell tests and information science and so on, especially the study on ions of biology, chemistry, medicine and environmental science, for example, heavy metallic ions (mercury, copper, lead), even if the trace, will bring the entironment and ecological balance of the entire water incalculable damage. This thesis consists of five chapters.In chaper1, briefly describes the general principles of recognition mechanism and fluorescent probes’s design, the concept of supramolecular chemistry, molecular recognition, fluorescence probes, and then briefly reviewed fluorescent probes in recent years.In chaper2, Synthesis of N, N-bis (ethoxycarbonyl) methyl amino benzaldehyde (B3)and bis (2-pyridylmethyl) benzaldehyde (C5) and then B3, C5, and pyrazine phosphate compounds linked by Wittig-Horner reaction, we got eight pyrazine styrene sensors, which were identified by NMR, MS and so on.In chaper3studied the influence of different solvents on the fluorescence molecule2-8, through the Reference method, we have got fluorescent quantum yield of fluorescent molecule2-8. By compared fluorescent molecule2-4, we knew2is a light-emitting best, but the three fluorescent molecules are similar in emission wavelength and fluorescence quantum yield. Although fluorescent molecules5-7are different in molecular structure, emission wavelength, the fluorescence quantum yield is essentially the same in acetonitrile. Fluorescent molecule7is the asymmetric structure (D-π-D’), while fluorescent molecule8is symmetrical structure (D-π-D), fluorescent molecule7change significantly in different solvents than fluorescent molecule8, but fluorescent molecule8has a much higher fluorescence quantum yield than fluorescent molecule7.In chaper4, the interaction between fluorescent molecules1-8with different metal ions was studied by fluorescence and absorption assay, and then we have a further research on the ion which is specific response to the fluorescent molecule. The conclusions are as following:1. Compared materials of fluorescent molecule1-3with structure and the ability to identify the metal ions, we can conclude that Hg2+may form stable complex with the O in the ester of fluorescent molecule3.2. Fluorescent molecule4,5contain the molecular structure DPA which can specific identify Cu2+. Fluorescent molecule5contains the strong electron donor-N(CH3)2, produced long-wavelength charge-transfer absorption peak, but fluorescent molecule4did’t find the new absorption peak.3. Fluorescent molecule6,7showed a strong binding capacity for Cu2+, while Fluorescent molecule8have a strong binding capacity with Fe3+and Cu2+, and with the increasing Cu2+concentration, the fluorescent molecule6,7had a similar trend in absorption spectrum. With the Fe3+join, the spectral red shift obviously. Therefore, Fe3+may be combined with the N of pyrazine.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Heterocyclic compounds
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