The Synthesis And Photoelectric Properties Of Novel Aggregation-induced Emission Materials Based On Tetraphenylethylene

Fluorescent materials occupy a very important position in photoelectric devices, thenew generation of display technology and sensor research. But most of the traditionalfluorescent materials have a serious problem: luminescence properties in aqueous solutionis very good, however, when aggregated in poor solvent or fabricated into film, fluorescentwill fell sharply, namely the fluorescence quenching. Since in practice, many of them areutilized in the solid state or thin film state, which greatly prohibit the application of largenumber of the phosphor. In2001, Tang found aggregation-induced emission, was totallyopposed to this phenomenon, very good to solve the problem, has opened up a new train ofthought for the development of this kind of phosphor. Tetraphenylethylene (TPE), as atypical aggregation-induced luminescence of small molecules, because of its synthesis issimple, easy to modify features, has attracted wide attention, more and more people join inthis study.In this paper, from the standpoint of molecular design, two novel compounds: P1andP2, based on tetraphenylethylene with AIE-active are synthesized, one containing acetylacetone group, and the other containing imidazole group. And a series of compounds arecharacterized by1H-NMR, we determine that the obtained compounds are the targetproduct.Study the optical properties of the target product, found that P1and P2whendissolved in dilute THF are weakly emissive. However, when added bad solvent water intothe THF solution, the PL intensity is greatly increased, which indicates that they are typicalAIE-active materials. Explore the UV-visible absorption spectrum and fluorescencespectrum of the synthetic material, the results showed that, the compounds are blue lightemitting material, in addition, with the increase of solvent polarity, the absorption peakhave undergone a blue shift.Since the introduction of the group of acetylacetone gives the desired product P1excellent complexing ability, we studied the effect of different ions on the fluorescence.From the research results, while the Cu2+，Cd2+，Mn2+，Na+，Ni2+，Ag+，Ca2+，Fe2+，Hg2+，K+，Mg2+，Pb2+was added to the THF/Water solution (Water fraction=50%) of P1,was little change in fluorescence, however, when Zn2+was added, the fluorescenceenhanced sharply, and with the added scale exhibits a linear change. Therefore, it haspotential applications as ion microprobe.Through a lot of experiments, we explored the experimental conditions of certain compounds, such as material ratio, reaction temperature, reaction time, amount of catalyst,and ultimately determined the optimal synthesis conditions. By understanding the factorsthat influence the course of the experiment, some traditional experimental procedure havebeen improved, which simplified the experimental program, solved some problems, andenhanced the yield.