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电化学  2014 

生物醌分子伏安响应的多电子转移辨析

DOI: 10.13208/j.electrochem.140432, PP. 533-537

Keywords: 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

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Abstract:

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.

References

[1]  Moser C M, Keske M, Warnke K, et al. Nature of biological electron transfer[J]. Nature, 1992, 355(6363): 796-802.
[2]  Ma W, Ying Y L, Qin L X, et al. Investigating electron-transfer processes using a biomimetic hybrid bilayer membrane system[J]. Nature Protocols, 2013, 8(3):439-450.
[3]  Yao C J, Zhong Y W, Yao J. Multi-center redox-active System: Amine-amine electronic coupling through a cyclometalated bisruthenium segment[J]. Inorganic Chemistry, 2013, 52(7): 4040-4045.
[4]  Bard A J, Faulkner L R. Electrochemical method: Fundamentals and applications (2nd ed)[M]. New York: Wiley & Sons, 2001: 108.
[5]  Heinze J. Cyclic voltammetry-“electrochemical spectroscopy”. New analytical methods (25)[J]. Angewandte Chemie International Edition, 1984, 23(11): 831-847.
[6]  Mir?eski V, Komorsky-lovri? ?, Lovri? M. Square-wave voltammetry: Theory and application[M]. Verlag Berlin Heidelberg: Springer, 2007: 1.
[7]  Ma W, Long Y T. Quinone/hydroquinone-functionalized biointerfaces for biological applications from the macro- to nano-scale[J]. Chemical Society Reviews, 2014, 43(1): 30-41.
[8]  Wang X W, Ma W, Ying Y L, et al. Bis-coenzyme Q0: Synthesis, characteristics, and application[J]. Chemistry-An Asian Journal, 2011, 6(4): 1064-1073.
[9]  Costentin C. Electrochemical approach to the mechanistic study of proton-coupled electron transfer[J]. Chemical Reviews, 2008, 108(7): 2145-2179.
[10]  Hui Y, Chng E L K, Chng C Y L, et al. Hydrogen-bonding interactions between water and the one- and two-electron-reduced forms of vitamin K1: Applying quinone electrochemistry to determine the moisture content of non-aqueous solvents[J]. Journal of the American Chemical Society, 2009, 131(4): 1523-1534.
[11]  Evans D H. One-electron and two-electron transfers in electrochemistry and homogeneous solution reactions[J]. Chemical Reviews, 2008, 108(7): 2113-2144.
[12]  Ma W, Li D W, Sutherland T C, et al. Reversible redox of NADH and NAD+ at a hybrid lipid bilayer membrane using ubiquinone[J]. Journal of the American Chemical Society, 2011, 133(32): 12366-12369.
[13]  Ma W, Zhou H, Ying Y L, et al. In situ spectroeletrochemistry and cytotoxic activities of natural ubiquinone analogues[J]. Tetrahedron, 2011, 67(33): 5990-6000.

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