In situ ESR spectroscopic evidence of the spin-trapped superoxide radical, O₂⁻, electrochemically generated in DMSO at room temperature

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• 作者：Piotr Pieta ; Andreas Petr ; Wlodzimierz Kutner ; Lothar Dunsch
• 关键词：Superoxide radical ; ESR ; Spin trapping ; Spectroelectrochemistry ; 5 ; 5-Dimethyl-1-pyrroline-N-oxide (DMPO)
• 刊名：Electrochimica Acta
• 出版年：2008
• 出版时间：10 March 2008
• 年：2008
• 卷：53
• 期：8
• 页码：3412-3415
• 全文大小：258 K

文摘

Superoxide radical (O₂⁻) was both electrochemically generated and detected at room temperature. In situ ESR spectroelectrochemistry with spin trapping was used for the radical detection. That is, the O₂⁻ radical was obtained in a DMSO solution under cyclic voltammetry conditions as soon as the potential of the dioxygen electroreduction was reached. This radical reacted then with a 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) spin-trap reagent present in solution to form the DMPO–OOH adduct. The hyperfine coupling constants determined for the adduct were a_N = 1.285 mT, and in accord to those reported in literature.