The Hydroxyl Radical is a Critical Intermediate in the Voltammetric Detection of Hydrogen Peroxide.

The Hydroxyl Radical is a Critical Intermediate in the Voltammetric Detection of Hydrogen Peroxide.
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DOI:
10.1021/jacs.5b13376
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发表时间:
2016-03-02
影响因子:
15
通讯作者:
Sombers LA
Sombers LA
中科院分区:
化学1区
文献类型:
--
作者:
Roberts JG;Voinov MA;Schmidt AC;Smirnova TI;Sombers LA

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循环伏安法是一种广泛使用的强大工具,用于灵敏和选择性地测量过氧化氢(H2 O2)。在此,伏安法与电子顺磁共振光谱相结合,以确定和定义的氧为中心的自由基在氧化过程中释放的H2 O2的作用。采用自旋捕获剂5,5-二甲基-1-吡咯啉N-氧化物(DMPO)和2-乙氧羰基-2-甲基-3,4-二氢-2H-吡咯-1-氧化物(EMPO)。光谱显示出明显的超精细模式,可以清楚地识别DMPO-OH·和EMPO-OH·加合物。伏安图的多元线性回归分析表明,羟基自由基是一个主要的贡献者的伏安法过氧化氢,信号衰减时,这种物种被捕获。这些数据纳入了一个失踪的,基本的元素,我们的知识的机制,基础H2 O2电化学。
Cyclic voltammetry is a widely used and powerful tool for sensitively and selectively measuring hydrogen peroxide (H2O2). Herein, voltammetry was combined with electron paramagnetic resonance spectroscopy to identify and define the role of an oxygen-centered radical liberated during the oxidation of H2O2. The spin-trap reagents, 5,5-dimethyl-1-pyrroline N-oxide (DMPO) and 2-ethoxycarbonyl-2-methyl-3,4-dihydro-2H-pyrrole-1-oxide (EMPO), were employed. Spectra exhibit distinct hyperfine patterns that clearly identify the DMPO-OH• and EMPO-OH• adducts. Multiple linear regression analysis of voltammograms demonstrated that the hydroxyl radical is a principal contributor to the voltammetry of H2O2, as signal is attenuated when this species is trapped. These data incorporate a missing, fundamental element to our knowledge of the mechanisms that underlie H2O2 electrochemistry.
DOI: 10.3109/10715769009145689
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