摘要
在HAc-NaAc(pH=4.0)缓冲溶液中,用循环伏安法(CV)、交流阻抗法(EIS)、紫外光谱和紫外差光谱研究了In(Ⅲ)与2,2′—联吡啶(bpy)的相互作用。结果表明:In(Ⅲ)离子的循环伏安图呈现一对准可逆的氧化还原波,bpy与In(Ⅲ)作用后,In(Ⅲ)的氧化还原峰电流明显降低、式量电位正移,扩散系数减小,电化学反应阻抗增大;In(Ⅲ)与bpy作用后,bpy的紫外光谱发生了明显变化,紫外差光谱表明In(Ⅲ)与bpy结合比为1:2。
Interaction between In （Ⅲ） and 2,2＇-bipyridyl was studied by the methods of cyclic vohammetry （CV） and ac impedance in the buffer HAc-NaAc（ pH -4. 0）. A quasi-reversible redox wave of Indium ion was observed. It has been found that after 2,2＇-bipyridyl acting with In（Ⅲ） ,the formal potential of In（Ⅲ） positively shifted from -0. 721 V to -0. 711 V,tbe values of the reduction peak current, diffusion coefficient and ks decreased significantly, and the electrochemical reaction resistance values increased from 178Ω2· cm^2 to 251Ω2 · cm^2. The result indicated that 2,2＇-bipyridyl acted with In （Ⅲ） apparently. The binding of In （111） to 2,2＇ -bipyridyl had been studied by means of UV spectra and difference UV spectra. The 1：2 stable In-bpy complex can be confirmed from spectral titration curves and Ae, the molar extinction coefficient of the complex,is 2. 12 × 10s cm^-1 · mol^-1 · L.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2008年第12期1556-1560,共5页
Chemical Research and Application
基金
山西省回国留学基金资助项目
山西省自然科学基金(2006011016)资助项目
