循环伏安法研究超分子有机凝胶中二茂铁的扩散

4,4′-二(硬脂酰胺基)-二苯甲烷(BSAPM)在LiClO4/碳酸丙烯酯(PC)中能形成超分子有机凝胶。用循环伏安法研究了包埋在凝胶中的二茂铁的氧化还原行为。结果表明,有机凝胶内的二茂铁仍具有氧化还原活性,其氧化还原行为是受扩散控制的单电子可逆转移过程。与溶液相比,最低化凝胶浓度下凝胶中二茂铁和二茂铁离子的扩散系数分别从5.62×10-6cm2/s和6.47×10-6cm2/s下降为3.32×10-6cm2/s和4.41×10-6cm2/s,且随凝胶因子浓度的增加,凝胶中二茂铁和二茂铁离子的扩散系数降低。

Study on Ferrocene Diffusion in Supramolecular Organogel Using Cyclic Voltammetry

The gelator, bis-(4-stearoylaminophenyl) methane (BSAPM) gelatinizes LiClO_4/propylene carbonate (PC), yielding a stable supramolecular organogel. The electrochemical redox reaction of a redox probe (i.e. ferrocene) trapped in this organogel has been studied by cyclic voltammetry. The results show that ferrocene can be electrochemically oxidized. The shape of the cyclic voltammograms corresponding to the electrochemical redox reaction in organogel is similar to that obtained in liquid electrolyte, which reveals that the reaction of ferrocene is a simply diffusion controlled, one electron transferred quasi-reversible process. Apparent diffusion coefficients of ferrocene (Fc)/ferricinium cation (Fc+) are determined. It shows slight decrease of the diffusion coefficients of Fc and Fc+ from 5.62×10~(-6) and 6.47×10~(-6) cm~2/s to 3.32×10~(-6) and 4.41×10~(-6) cm~2/s from the liquid to organogel state of the minimum gel concentration, respectively. Furthermore, the diffusion coefficients of Fc and Fc+ in organogels decrease with an increase of the concentration of gelator BSAPM.