电化学和紫外光谱研究In(Ⅲ)与2，2＇-联吡啶的相互作用  

Study on the interaction between In(Ⅲ) and 2,2′-bipyridyl by the methods of electrochemistry and UV spectrum

作　　者：王俊伟[1] 周保娟[1] 田燕妮[1] 

机构地区：[1]山西大学分子科学研究所,化学生物学与分子工程教育部重点实验室,山西太原030006

出　　处：《化学研究与应用》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

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.

关 键 词：In(Ⅲ) 2 2’-联吡啶 电化学 光谱 

分 类 号：O646.5[理学—物理化学]