Reaction of Organic Peroxyl Radicals with <sup>•</sup>NO<sub>2</sub> and <sup>•</sup>NO in Aqueous Solution: Intermediacy of Organic Peroxynitrate and Peroxynitrite Species
作者:Sara Goldstein、Johan Lind、Gabor Merenyi
DOI:10.1021/jp037431z
日期:2004.3.1
alkyl peroxynitrates, which are in equilibrium with the parent radicals and have no appreciable absorption above 270 nm. It is also shown that •NO adds rapidly to (CH3)2C(OH)CH2OO• and CH3OO• to form alkyl peroxynitrites. The rate constants for these reactions were determined to be 2.8 × 109 and 3.5 × 109 M-1 s-1, respectively. However, in contrast to alkyl peroxynitrates, alkyl peroxynitrites do not
在这项工作中,我们使用脉冲辐解技术研究了烷基过氧自由基与•NO2 和•NO 的反应。•NO2 与(CH3)2C(OH)CH2OO•、CH3OO• 和c-C5H9OO• 反应的速率常数在7 × 108 和1.5 × 109 M-1 s-1 之间变化。该反应产生相对长寿命的过氧硝酸烷基酯,它与母体自由基平衡,在 270 nm 以上没有明显的吸收。还表明•NO 迅速加入(CH3)2C(OH)CH2OO• 和CH3OO• 以形成烷基过氧亚硝酸盐。这些反应的速率常数分别确定为 2.8 × 109 和 3.5 × 109 M-1 s-1。然而,与过氧硝酸烷基酯相比,过氧亚硝酸烷基酯不会积累。相反,它们通过沿相对较弱的 O-O 键均裂而迅速分解,最初形成一对。这对中的大部分在笼中坍缩形成硝酸烷基酯RONO2,大约14% 以游离烷氧基和•NO2 自由基的形式扩散出来。热动力学分析预测 CH3 的半衰期..