二茂铁表面活性剂电化学行为的胶束效应

Electrochemical Behavior of Ferrocenyl Surfactant in Micellar System

采用循环伏安法研究了具有可逆特性的二茂铁表面活性剂Fc12在pH值为2的0.1 mol.L-1Li2SO4溶液中的电化学行为的胶束效应,讨论了扫描速度及底物浓度对Fc12电化学行为的影响。结果表明,Fc12具有良好的可逆变化特性,可在氧化态(I2+)与还原态(I+)之间实现自由转换;Fc12在玻碳电极上的峰电流(Ipc)与扫描速度的平方根呈线性关系(R=0.997),说明Fc12的电化学行为是受扩散控制的可逆过程;Ipc和扩散系数(D)在Fc12的临界胶束浓度(CMC)附近出现突变,Ipc和D随Fc12单体的浓度变化较快,超过CMC后,Ipc与D随表面活性剂浓度缓慢变化,与Fc12表面张力变化趋势相吻合。

Effect of micellar on electrochemical behavior of ferrocenyl surfactant（Fc12） was studied in pH=2 and 0.1 mol·L-1 Li2SO4 solution with cyclic voltammetry.The influences of scan rate and substrate concentration on the electrochemical behavior were discussed.It was showed that Fc12 possessed well reversible characteristic,which realized reversibility between reduction（I＋） and oxidation（I2＋） freely.Otherwise,based on the linear relation between the peak current（Ipc） and square root of scan rate with a 0.997 correlation coefficient,the electrochemical behavior of Fc12 was a diffusion-controlled reversible process.The Ipc and diffusion-coefficient（D） changed abruptly around the critical micellar concentration（CMC） of the ferrocenyl surfactant.They altered sharply with Fc12 monomer concentration,but altered tardily with Fc12 concentration above the CMC.The trendency was coincided with the change of surface tension.