摘要
以循环伏安及循环伏安-光谱电化学方法研究了铁-邻菲咯啉配合物的电化学行为,Fe2+与邻菲咯啉生成1∶3配合物,给出一对受扩散控制的可逆氧化还原峰。自由Fe2+在-0.24V电位处,给出了一表面控制的不可逆还原峰。由氧化过程中的光谱电化学数据获得式电位为E0=0.875V(vs.Ag/AgCl)和电子转移数为n=1.0。由还原过程的循环伏安-光谱电化学数据发现,[Fe(phen)3]3+的电化学还原过程为产物弱吸附的自加速过程,获得裸电极上的标准速率常数为k0=1.14×10-3cm/s,电子转移系数为α=0.189。Langmuir吸附常数β=0.059(±0.007),吸附表面上的电子转移系数为αa=0.313,反应速率常数为k0a=1.24(±0.17)×10-3(cm/s),式电位为:0.11±0.01V(SD=0.184)。
The complexes of iron and phenanthroline (Phen) with ratio of 1:3 was studied by cyclic voltammetric spectroelectrochemistry. This complex shows a reversible redox peaks with E^0′=0.872V (vs. Ag/AgCl). The free Fe^2+ ion gives a irreversible surface controlled peak at about -0.24V. From the cyclic voltammetric spectroelectrochemical data in reduction process,E^0=0.875V and n=1.0 was obtained. From those in oxidation process, it was found that reduction of [-Fe(phen)3]^3+ foUows a weak product-adsorption self-acceleration mechanism with k^0=1.14×10^-3cm/s, α=0.189, adsorption constant β=0.059 (±0.007) and formal potential of 0.11±0.01V (SD=0.184) at bare electrode,and αa=0.313,κn^0=1.24(+0.17)×10^-3(cm/s) at adsorbed electrode.
出处
《光谱实验室》
CAS
CSCD
2005年第5期897-900,共4页
Chinese Journal of Spectroscopy Laboratory
关键词
循环伏安
长光程薄层光谱电化学
铁-邻菲罗啉配合物
Cyclic Voltammetry,Long Optical Length Thin layer Spectroelectrochemistry,IronPhenanthroline Complex