Resolve Mono-Electronic Process in the Voltammetric Behaviors of Multi-Redox Bis-Coenzyme Q₀

Authors

Hao ZHOU, Key Laboratory of Advanced Material (ECUST), Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;
Yi-tao LONG, Key Laboratory of Advanced Material (ECUST), Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;Follow

Corresponding Author

Yi-tao LONG(ytlong@ecust.edu.cn)

Abstract

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.

Graphical Abstract

Keywords

coenzyme Q0, electron communication, square-wave voltammetry, multi-electron transfer, mono-electronic discrimination

DOI Link

https://doi.org/10.13208/j.electrochem.140432

Publication Date

2014-12-28

Online Available Date

2014-06-28

Revised Date

2014-06-23

Received Date

2014-04-29

Recommended Citation

Hao ZHOU, Yi-tao LONG. Resolve Mono-Electronic Process in the Voltammetric Behaviors of Multi-Redox Bis-Coenzyme Q₀[J]. Journal of Electrochemistry, 2014 , 20(6): 533-537.
DOI: 10.13208/j.electrochem.140432
Available at: https://jelectrochem.xmu.edu.cn/journal/vol20/iss6/6