二茂铁表面活性剂的合成及其电化学行为研究  

Synthesis and electrochemical behavior of ferrocenyl surfactant

作　　者：杨志[1] 李英杰[1] 田森林[1] 牛艳华[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650093

出　　处：《应用化工》2011年第7期1121-1124,1130,共5页Applied Chemical Industry

基　　金：国家自然科学基金(20607008;21077048);昆明理工大学分析测试基金(2010178)

摘　　要：合成了具有可逆特性的二茂铁表面活性剂N,N-二甲基二茂铁甲基正辛烷基溴化铵(Fc8),并以玻碳电极为工作电极,采用循环伏安法研究了Fc8在0.1 mol/L NaCl溶液中的电化学行为,讨论了pH、扫描速度及底物浓度对Fc8电化学行为的影响。结果表明,Fc8在pH<8的条件下具有良好的可逆性,可在氧化态(I2+)与还原态(I+)之间实现变换;Fc8在玻碳电极上的氧化峰电流(Ipc)与扫描速度呈现线性关系(R2>0.998),说明Fc8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Fc8的临界胶束浓度(CMC)附近出现突变,在CMC以上,Ipc与D随表面活性剂浓度缓慢变化,该规律与Fc8表面张力变化趋势吻合,表明峰电流和扩散系数随Fc8浓度变化较快。The reversible surfactant（ferrocenylmethyl） octanedimethylammonium bromide（Fc8） was synthesized.Effect of micellar on electrochemical behavior of Fc8 was studied in 0.1 mol/L NaCl solution with cyclic voltammetry using glassy carbon electrode as working electrode.The influences of pH,scan rate and concentration on the electrochemical behavior were investigated.It was showed that Fc8 possessed well reversible characteristic with the pH value less than 8,which realized reversibility between reduction（I＋） and oxidation（I2＋） freely.Otherwise,based on the linear relation between the peak current（Ipc） and scan rate with more than 0.998 correlation coefficient,the electrochemical behavior of Fc8 was a diffusion-controlled reversible process.The Ipc and diffusion coefficient（D） changed around the critical micellar concentration（CMC） of the ferrocenyl surfactant and altered tardily with increasing concentration above the CMC.The results indicated that the trendency was coincided with the change of surface tension,which Ipc and D altered sharply with increasing monomer concentrations.

关 键 词：可逆表面活性剂 循环伏安法 胶束效应 扩散系数 

分 类 号：TQ035[化学工程] O657.1[理学—分析化学]