The Investigation Of Calixarene Derivatives LB Film And Its Analytical Application

The LB technique is an elegant method to investigate the floating monolayer on the water surface and to transfer the floating monolayer onto a suitable solid substrate. LB film technique has also an important place in physics, chemistry, biology and molecular electronics to produce uniform and high quality organic thin films. The film thickness and molecular architecture of such films can easily be controlled using the LB film technology. Calixarene molecules are very powerful ligands for ions and small molecules and for this reason they have been studied with several techniques as models for host-guest systems during the last years. Amphiphilic calixarenes are suitable LB film materials. Many of new amphoteric calixarenes have been synthesized and the studies of their property and application are in an early stage of development. Whereas the advancement of the LB technique, the studies with it on the complexation and structural properties of calixarene would be feasible and effective. With this in mind, we investigated the properties of new calixarene derivatives monolayer and its application in analytical chemistry. In this paper, the main work and results are summarized as following:1.Monolayer formation and Langmuir-Blodegett (LB) film fabrication of p-tert-butyl-sulfonylcalix[4]arene (SCA) at an air-water interface on subphases with different pH values and subphases containing different metal ions were investigated. Some information regarding the packing density in monolayer, molecular orientation and complexion by metal ions has been obtained. At the air-water interface the amphiphilic SCA molecules adopt a cone conformation. SCA with its complexing head group in contact with the aqueous phase can form metal complexes with Pb²⁺ ions present in the aqueous phase. The formation of SCA-Pb complexes leads to changes in the area per SCA molecule and in the collapse pressure, as well as changes in the present of a great lot of proton, which are in agreement with a parallel-perpendicular orientation translation. And there were no the special phenomenon when the other metal ions present. The results show SCA has selective recognition for Pb²⁺.2. A glassy carbon electrode modified LB films of SCA (including Pb²⁺) was successfully prepared and its electrochemical properties were studies by using several electrochemical method. The electro reaction process was investigated and some kinetic parameters were obtained. At the same time, the coordination number of complex was also calculated according to the surface coverage of redox active species and area of per molecule on electrode surface.3. The properties of the LB film of diamino calix[4]arene derivative(ACA) and its analytical application were investigated. ACA is able to form stable monolayer on pure water. LB film of ACA modified glassy carbon electrode was advanced and used for determining nitrite ion in phosphate buffer. Calibration plot was found to be linear in the range of 1×10^-6 mol/L to 1×10^-3 mol/L. Other hackneyed anions have no influence in determination almost.