The Synthesis And Application Of Fluorescent Probes Based On The The Rhodamine Class Of "OFF-ON"

In the scientific research,People choose a appropriate sensor depends on weather it is sensetive to ion, Selective ion single and stable and Portable and easy to carry in use。Fluorescent sensors precisely with all the above advantages. The rhodamine framework is an ideal mode to construct fluorescent chemosensors and it has a rigid coplanar structure. And Because of its Stable performance in the fluorescence spectra performance, scientists always use it as a common fluorescent dye。This thesis is a general briefing fluorescent sensor, as well as the metal-basedrhodamine fluorescence sensor。First of all, Gradual improvement in accordance with the development from birth to the context of the framework, The scientists detailely overview the rhodamine sensor。What we do is that we make Rhodamine-based compound as the reaction substrate, and synthesize rhodamine derivatives which have good fluorescent。By Adding small groups to Synthetic derivatives, We make them as new rhodamine fluorescence sensor which have a stable structure, high fluorescence yield。These work laid the foundation for our further research.. The Synthetic derivatives were identified by1H NMR,13C NMR。 And then on the basis of the previous, by reading literature we Worked out the required test conditions for the Spectroscopy, and The properties of probes with various ions were also analysed。Analytical results show that the receptor2-1has high selectivity and sensitivity to Fe3+and2-1-Fe3+has high selectivity and sensitivity toCN-inCH3CN/H2O(1:1,v/v), Moreover,The compounds2-4,2-5have a high fluorescence quantum yield, which Provides a new way of thinking for the application of fluorescent dyes in biologicalfluorescence labeling field.