Preparation And Properties Of A Self-Organized Fluorescent Chemosensor For Thiacalixarenes And Their Derivatives

The fluorescence probe has gradually been a hot research topic in the water heavy metal ion detection field, for their advantages of fast and efficient detection. However, the self-organized chemosensors, which are based on the micelle template, have attracted a lot of attentions because of their advantages, such as simple structure, convenience in the improvements of measuring capability,and many other advantages. In this paper, thiacalix[4]arenes and their primary alcohol derivatives, which have good recognition characteristics with heavy metal ions, are chosen as the receptors. Perylene as the fluorescent and some compound surfactants as self-organized template agent. In this way, a ON-OFF fluorescent chemosensor for Cu2+ ion is prepared,and their structures are characterized. In this paper, by the fluorescence quenching analysis experiment, we test the amount of surfactant, the concentration of solution pH、the receptor and the phosphor on the influence of Cu2+ which based on thiacalix[4]arenes and their primary alcohol derivatives.Form the ultraviolet absorption spectrum, which are used to characterize the process of the preparation of the fluorescent probe, we can know whether the receptor and phosphor have been loaded into the surfactant micelles and the self-organized process did not affect each other’s characteristics. In this experient of the self-organized fluorescent chemosensor based on thiacalix[4]arenes, more eff-orts will be put on the effect of mixed surfactants. And in the experiment, we research three kinds of surfactant, such as nonionicsurfactant(TX-100)、Cationic surface active agent(DTAB、TTAB)、 An-ionic surfactant(SDS、SDBS), which form four combined surfactant: nonionicsurfactant/Cationic surface active agent, Cationic surface active agent/Cationic surface active agent, nonionicsurfactant/An-ionic surfactant, An-ionic surfactant/An-ionic surfactant.It turned out that when the concentration of phosphor is under the condition of 10-7mol/L, and the proportion of combined surfactant respectively is TX-100/DTAB 0.5:0.5, TX-100/TTAB 0.5:0.5. DTAB/TTAB 0.5:0.5、 TX-100/SDBS 0.5:0.5. SDS/SDBS 0.5:0.5. Under these conditions, the self-organized fluorescent chemosensor based on thiacalix[4]arenes has a good effect on Cu2+.At this moment, the pH value in the combined surfactant respectively is 5.0,6.0,6.0,6.0. 6.0. While in the experiment of the self-organized fluorescent chemosensor based on primary alcohol derivatives of thiacalixarenes, it turned out that, when the concentration of phosphor is under the condition of 10"7mol/L, the concentration of DTAB is 400mmol/L, the pH value is 5.0, and the primary alcohol derivatives of thiacalixarenes concentrations is 2.5×10-4mol/L. In these conditions, the fluorescent chemosensor has a good effect on Cu2+ions. And in a certain range of the concentrations of Cu2+ ions, it can be almost linearly measured.