The Synthesis And Application Of Fluorescent Probes In Detection Of Water Content In Organic Solvents

Water content is an important parameter in organic solvents, because it can affect the nature of the organic solvents, and further to influence the reaction of the experiments. Its measurement is of significant for many industries and technologies.The main task of this paper is to design and synthesis some new fluorescent probes that could easy to detect the water content in organic solvents. Its including the following three aspects:(1) A new probe of polarity sensitive Chalcone derivatives R was synthesized through the Schiff base reaction of 4'-N,N-dimethylamino-4-amino-Chalcone and Anthraldehyde. The fluorescence spectra of the probe in different solvents were studied. The fluorescence intensity of probe was significantly reduced with the increasing of polarity of solvents and can be used to monitoring the water content in organic solvents. In the experiment, the authors take the ethanol for example, a method of fluorescence analysis to determinate water content in ethanol was proposed. In the range of ca. 0.00-4.00%(v/v), the fluorescence intensity of R changed as a linear function of water content, and the detection limit could be as low as 0.0115%. Additionally, the method has the advantages of high sensitivity, simple and rapid.(2) A new fluorescence water probe for the determination of water content in organic solvents. The design and the analytical characteristics of a water sensitive fluorescence probe are described. A new complex of Ru(5-amino-phen)3 was synthesized and used as a fluorescence indicator. It is observed experimentally that with an increase of solvent polarity, the Ru(5-amino-phen)3 fluorescence intensity changed dramatically. And it is different from the other Ru(â…¡) compounds, it is oxygen insensitive. It is demonstrated that such complex can be employed as an indicator for water detection due to its favorable sensitivity to solvent polarity.(3) 9-Anthraldehyde was prepared as a fluorescence probe for determining water content in organic solvents. Changing from a non-polar to a polar solvent increases the solvent interaction with the emission spectrum shifts to longer wavelengths. The fluorescence intensity of the probe increased with the increasing concentration of water. In the range of 0.00-4.00%(v/v), the linear equations was I= 67.3029 [H2O]%+ 106.1060 (R=0.9996) and the Anthraldehyde fluorescence intensity changed as a linear function of water content. The detection limits were 0.0053% for ethanol. The prepared probe was successfully employed for preliminary application in determining water content in organic solvents.