生物醌分子伏安响应的多电子转移辨析

CORC > 厦门大学 > 2014年第20卷

	生物醌分子伏安响应的多电子转移辨析; Resolve Mono-Electronic Process in the Voltammetric Behaviors of Multi-Redox Bis-Coenzyme Q0
	周浩 ; 龙亿涛 ; ZHOU Hao ; LONG Yi-tao
刊名	http://electrochem.xmu.edu.cn/CN/abstract/abstract10117.shtml
	2014-12-28
关键词	辅酶Q0 电子相互作用方波伏安法多电子转移分峰单电子响应辨析 coenzyme Q0 electron communication square-wave voltammetry multi-electron transfer mono-electronic discrimination
英文摘要	电化学反应中，一个基元电子转移反应仅对应一个电子交换，实际上多电子转移反应也涉及对应数目的单电子转移步骤，分离、辨析每个电子基元反应的氧化还原峰电位十分重要. 本文以辅酶Q0（CoQ0）、亚甲基桥连双辅酶Q0（Bis-CoQ0）为模型，采用循环伏安和方波伏安技术研究其电化学特性，提出了一种应用于多电子转移体系、分析单个电子转移电位的方法. 实验表明，CoQ0经历两步单电子还原反应；Bis-CoQ0中两个醌单元发生强电子相互作用，电极过程为4电子多步转移. 对于表观上的4电子“三步”转移反应，拟用Lorentzian-Gaussian分峰拟合CoQ0和Bis-CoQ0体系方波伏安响应曲线，分别获取每个电子转移步骤的电位，进一步证明Bis-CoQ0经历四分步单电子转移反应，为热力学研究提供更多信息.; A widely held concept in electrochemistry is that truly elementary electron-transfer reactions always involve the exchange of one electron, therefore, an overall process involving a change of n electrons must involve n distinct electron-transfer steps. It is highly desirable to resolve multiple-step electron transfer reactions into each electron transfer step. The electrochemical behaviors of coenzyme Q0 and methylene-bridged Bis-coenzyme Q0 were investigated by cyclic voltammetry and square wave voltammetry in nonaqueous dichloromethane containing 0.15 mol·L-1 Bu4NClO4 as the supporting electrolyte. The redox reaction of coenzyme Q0 is well described as two chemically reversible one-electron reduction processes. Bis-coenzyme Q0 exhibits three redox waves in voltammetric experiment, as two bridged coenzyme Q0 units show strong intramolecular electron communication. Experimental data were curve fitted with a Gaussian and Lorentzian mixed product function after subtracting the Shirley background. Results show that four-electron reduction of Bis-coenzyme Q0 is preceded by stepwise pathways, defining as four successive, mono-electronic electron-transfer steps.; 国家杰出青年基金（No. 21125522）和上海高校特聘教授（东方学者，跟踪计划）资助; 作者联系地址：华东理工大学结构可控先进功能材料及其制备教育部重点实验室，上海 200237; Author's Address: Key Laboratory of Advanced Material ECUST, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China; 通讯作者E-mail：ytlong@ecust.edu.cn
语种	中文
出版者	厦门大学《电化学》编辑部
内容类型	期刊论文
源URL	[http://dx.doi.org/10.13208/j.electrochem.140432]
专题	2014年第20卷
推荐引用方式 GB/T 7714	周浩,龙亿涛,ZHOU Hao,等. 生物醌分子伏安响应的多电子转移辨析, Resolve Mono-Electronic Process in the Voltammetric Behaviors of Multi-Redox Bis-Coenzyme Q0[J]. http://electrochem.xmu.edu.cn/CN/abstract/abstract10117.shtml,2014.
APA	周浩,龙亿涛,ZHOU Hao,&LONG Yi-tao.(2014).生物醌分子伏安响应的多电子转移辨析.http://electrochem.xmu.edu.cn/CN/abstract/abstract10117.shtml.
MLA	周浩,et al."生物醌分子伏安响应的多电子转移辨析".http://electrochem.xmu.edu.cn/CN/abstract/abstract10117.shtml (2014).