Schiff Base Application Research Of Chemical Sensors

Schiff base is an ideal fluorescent molecules，it has many advantages. it shows anattractive prospect in chemical sensors. In my experiment, I synthesized two differentSchiff bases,we found that the Schiff bases can used as F-and Cu²⁺ chemical sensors.we also synthesized an iridium complexes film materials, the article mainly includingthe following three parts:1.Salicylaldehyde Schiff bases used as F-and Cu²⁺bifunctional chemical sensorsIn this paper we synthesis an organic compounds, it used the salicylaldehyde asthe fluoride ion recognition groups, and make the carbon-nitrogen double bondconnect with the4-amino-1,8-naphthalimide groups. when we add the fluoride ionsinto the compound solution, we found that the color of the solution changes and thefluorescence quenching. However, other anions did not affect the color of the solutionand fluorescence. We also see that only when the copper ions added into the solution,the color changes and the fluorescence quenching. While other cations have no impact.So we can have a conclusion that the compounds can be used as the F-and Cu²⁺"turn-off" fluorescent chemical sensors.2.The synthesis of the iridium thin film materials and the application in chemicalsensingIn this article we synthesis an iridium complexes, which has no phosphorescencewhen in solution,while has a strong red phosphorescence when in the solid state.wealso synthesis a thin film that is form of the iridium complexes doped withPMMA.we also found that the film has a good specific response when the F-exist, thefluorescence of the film quenching, and the color changes, while other anions havelittle impact.3.8-hydroxyquinoline Schiff bases used as F-chemical sensorsWe synthesized a Schiff bases compound containing8-hydroxyquinoline, wasfound that when adding the F-the UV absorption spectrum and the phosphorescenceemission spectrum changed, the HNMR analysis showed that F-got rid of the protonof N-H caused the fluorescence emission quenching and the color changed. So we can also have a conclusion that the compounds can be used as the F-"turn-off" fluorescentchemical sensors.