The Research Of Zinc Ion Fluorescent Sensor Loaded With Polymer

Molecular fluorescence has broad application prospects in supramolecular chemistry, materials chemistry, analytical chemistry, environmental chemistry and other disciplines, has gradually become a hot area of research in various disciplines. Compared with other methods, fluorescence analysis method has the advantages of high selectivity, high sensitivity, easy to operate and has drawn greater attention. Therefore, the design and study of functionalized fluorescent molecules has an extremely important significance.The fluorescent sensor quinoline matrix with good selectivity and low toxicity, so often used in the zinc ion concentration detection of the organism. Fluorescent compound of small organic molecules, however, there are some shortcomings in practical applications, such as pollution system, can not be reused, difficult to produce film-forming limitations. Fluorescent compound is a small molecule by using different chemical means is introduced into the main chain of the polymer, the side chain or the chain ends, which makes the polymeric fluorescent probe can not only overcome the limitations on the use of fluorescent small molecules, can also itself certain advantages.Quinoline derivatives of this paper will introduced into the polymer chain end of the type of the two results, the obtained target compound not only has a quinoline good fluorescence properties, but also has the advantages of polymeric, in the fluorescence sensor has a broad application prospects.The papers mainly the following aspects of the work:1. The design and synthesis of this article fluorescent monomer Bn-TSQ,’HNMR spectra confirm the structure and test its optical properties.2. By click reaction and esterification methods synthesized respectively the target compounds PS-TSQ and PEG-TSQ, and the compounds are characterized by’HNMR, TOF-MASS, et al.3. Fluorescence spectroscopy of the main compound of the fluorescence sensing behavior of the metal ions, results show that the three target compounds are of Zn2+showed good fluorescence response and good selectivity. Job experiments show that the compound of Zn2+ratio of2:1; fluorescence titration experiments showed that:PS-TSQ Zn2+effect of complexation constants K of8.7×103M-2in acetonitrile solution; PEG-TSQ Zn2+effect of complexation constant K is5.4x104M’2in aqueous solution, and the two polymers can be recycled at room temperature. Therefore, the compound PS-TSQ the PEG-TSQ expected as a new fluorescent sensor for Zn2+.4. In addition, the compound PEG-TSQ is a colorimetric sensor.When the zinc ions are added to the system, we can be directly observed in the color of the solution turns yellow from red instantly with the naked eye, it indicates that the compound is highly sensitive for Zn2+; The experimental results show the target polymer can be recycled. PEG-4000is a low toxicity, water-soluble and bio-compatibility. Therefore, the compound has good application prospects in the field of biochemistry optical functional materials.