席夫碱自组装单分子膜的电化学研究

Base on the supramolecular chemistry and molecular engineering the self-assembled monolayers(SAMs) of derivative compound of Schiff base tailored with -SH group and its composite monolayers, which were firstly formed on Au substrate, were characterized and investigated using cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) techniques. All the results confirmed their formation. Comparing with the SAMs of alkanethiol, the SAMs of Schiff base were relatively loose. An electrochemical irreversible reduction/oxidation process of the schiff base molecule in 0.1 mol·L-1 KCl solution was found. Electrochemical study shows that the apparent electron-transfer rate conctant decreases with the increasing of assembled time. The apparent thickness of the composite monolayers, which was calculated to be about 10 CH2 basing on the previous formula, suggesting that Schiff base in the composite monolayers was displayed in a linear way. The complexation of Cu2+ and Ca2+ with the Schiff base also detected using EIS method. The results established important base for indepthly investigation the mechanism of electron-tasfer in SAMs of Schiff base, mechanism of compiexation with metal ion and activity of Schiff base in organism.Otherwise, we have synthesized two Schiff bases with different alkyl chains length and investigated their monolayer behavior and LB film characteristics by UV-vis absorption spectra, fluorescence spectra and infrared spectra. The results indicate that two compounds form J-aggregate in LB films, and the Schiff base with the longer alkyl chains is more orderly in LB film and have photoluminescnece properties..

从超分子化学和分子工程学解度出发，利用分子组装技术和电化学研究方法；创新性地构筑席夫碱功能分子的自组装膜体系；系统考察席夫碱类硫醇衍生物的自组装机理和自组装动力学规律；对具有生物活性及光致异构化的席夫碱自组装膜的结构及其异相间的长程电子转移机理进行探索性地研究。.