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The Synthesis And Properties Of Fluorescent Sensor For Bismuth Based On Rhodamine B

Posted on:2016-05-05Degree:MasterType:Thesis
Country:ChinaCandidate:L W YuFull Text:PDF
GTID:2308330461481016Subject:Chemistry
Abstract/Summary:PDF Full Text Request
Via transforming the molecular recognition information into the optical signal easy to monitor, fluorescent chemosensor has become the preferred method for detecting a complex system metal ion, based on its specific selective, high sensitivity, convenient and efficient nature. How to design and synthesize a sensor with the specified function had been studied extensively.Rhodamine derivatives are ideal fluorescent dyes. Fluorescent probes based on Rhodamine have good physical properties, such as high fluorescence quantum yields, high absorption coefficientsl, long absorption and emission wavelengths. Moreover the emission wavelength of most of rhodamine derivatives were under 600nm, fluorescence interference from the organism itself is litter, so they have been widely used in the field of chemical and biological analysis. DPA is a common recognition of the Group. Its three nitrogen atoms containing nonbonding electron may be partially or simultaneously involved with the complex. Based on this, it is also commonly used synthesis of fluorescent chemosensors.Based on the two points, in the paper, we have synthesized a new fluorescent chemosensor L1 based on rhodamine B and DPA. The structure of compound L1 has been determined by 1HNMR spectra, IR spectra and MS spectra. For systematically studying fluorescence properties and selective signaling toward different metal ions, the UV-vis spectra and fluorescence spectra of sensor L1 were conducted respectively. The results indicate that L1 is a fluorescence molecule with a strong fluorescence intensity. Chemosensor L1 exhibits a obvious fluorescence quenching only toward Bi3+ over other metal ions in EtOH/H2O (4:l,v:v) with high selectivity. The fluorescence response of L1 to Bi3+ is hardly affected by other metal ions and the detection limit reaches to 10’6M. Therefore, fluorescence chemosensor L1 can be applied to detect Bi3+.
Keywords/Search Tags:fluorescent chemosensors, rhodamine B, Bismuth ions, DPA
PDF Full Text Request
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