Method for synthesis of novel pyrimidine fluorescent opening type optical probe materials and for applying materials in mercury ion detection

Abstract

When I<-> is added in a blue light emitting conjugated polymers with a main chain containing pyrimidine, along with increase of the I<-> (a KI aqueous solution), I<-> shows a heavy atom effect and makes fluorescence of a polymer solution (THF) quenched gradually, and the appearance color of the solution is changed from colorless to yellow. Contrast experiments under same conditions show that introduction of other anions does not make optical properties of the polymers produce similar change. With utilization of high binding constant and complexing ratio of Hg<2+> and I<->, addition of Hg<2+> makes the fluorescence of the polymer complex restored gradually, and the appearance color is restored to colorless from yellow; through analysis of fluorescence emission properties of the polymers in the presence of Hg<2+> with gradually increased concentration, the detection limit on Hg<2+> is indicated to reach about 0.89*10<-4> mol / L, and through the contrast experiments, the presence of background metal cations is indicated to have no obvious interference on Hg<2+> optical response. Experimental results show that the polymers are turn-on type Hg<2+> optical probe materials having relatively high sensitivity and interference resistance. Abstract attached drawings are ultraviolet-visible absorption (UV-Vis) and fluorescence emission spectra charts of the polymer solution (the concentration of THF is about 1.86*10<-5> mol / L).

Description

technical field [0001] The invention relates to the synthesis of a novel pyrimidine fluorescent open optical probe material and its application to mercury ion detection, and it is used as a selective optical probe for mercury ion sensing. Background technique [0002] With the continuous development of science and technology, selective optical probes for mercury ion sensing are widely used in various fields, and the requirements for their performance are getting higher and higher. On the basis of traditional detection methods such as atomic absorption spectroscopy, cold atomic fluorescence spectroscopy and gas chromatography, the probe material is properly modified to improve its measurement sensitivity, shorten the test consumption time, simplify the sample preparation process and the required equipment, and develop new Hg 2+ Detection related materials and methods have become one of the main research hotspots at home and abroad. [0003] Hg 2+ It is one of the transitio...

AI Technical Summary

Problems solved by technology

However, from the current related reports, it can be seen that most of these probe molecules are in the optical signal "turn-off" mode, that is, Hg 2+ The presence of will cause the fluorescence quenching of the probe molecule

The detection selectivity and anti-interference of turn-off type probes are poor, and the current turn-on type Hg based on CPs 2+ There are few reports on optical probes, so it is necessary to prepare turn-on Hg based on CPs with relatively simple structure and high detection sensitivity. 2+ Optical Probe Materials

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