Kinetic study of one-electron reduction of aromatic quinones with aminoalkylamino side chains in N,N-dimethylformamide by square wave voltammetry and allied techniques
✍ Scribed by Chia-Yu Li; Jenn Jenq
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 800 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
A slightly modified Osteryoung-O'Dea method (square wave voltammetry in conjunction with the method of simplex optimization) was used to determine the heterogeneous kinetic parameters, u, E;,, , and k,, of the first-step reduction of naphtho-and anthraquinones substituted with chloro-, methyl-, and [2-[(2-hydroxyethyl)amino]ethyl]amino and [2-(dimethylamino)ethyl]amino groups.
All electrochemical measurements, including cyclic voltammetry, chronoamperometry, and chronocoulometry, were carried out in NJ-dimethylformamide using a mercury electrode. Results indicate that the reductions are quasi-reversible in nature with rate constants in the order of N 0.01406 cm s-i. The substituent effect exerted by the electron-releasing aminoalkylamino side chains on the reduction of quinones and the influence of the side chains on the heterogeneous kinetics were noted.