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Standard Gibbs Free Energies of Reactions of Ozone with Free Radicals in Aqueous Solution: Quantum-Chemical Calculations

机译:水溶液中臭氧与自由基反应的标准吉布斯自由能:量子化学计算

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摘要

Free radicals are common intermediates in the chemistry of ozone in aqueous solution. Their reactions with ozone have been probed by calculating the standard Gibbs free energies of such reactions using density functional theory (Jaguar 7.6 program). O2 reacts fast and irreversibly only with simple carbon-centered radicals. In contrast, ozone also reacts irreversibly with conjugated carbon-centered radicals such as bisallylic (hydroxycylohexadienyl) radicals, with conjugated carbon/ oxygen-centered radicals such as phenoxyl radicals, and even with nitrogen- oxygen-, sulfur-, and halogen-centered radicals. In these reactions, further ozone-reactive radicals are generated. Chain reactions may destroy ozone without giving rise to products other than O2. This may be of importance when ozonation is used in pollution control, and reactions of free radicals with ozone have to be taken into account in modeling such processes.
机译:自由基是水溶液中臭氧化学中的常见中间体。通过使用密度泛函理论(Jaguar 7.6程序)计算此类反应的标准吉布斯自由能,探索了它们与臭氧的反应。 O2仅与简单的以碳为中心的自由基发生快速不可逆的反应。相比之下,臭氧还与以碳为中心的共轭碳基自由基(例如双烯丙基(羟基环己二烯基)自由基),以碳/以氧为中心的共轭自由基(例如苯氧基),甚至与以氮,氧,硫和卤素为中心的自由基发生不可逆反应。 。在这些反应中,进一步产生了臭氧反应性自由基。连锁反应可能会破坏臭氧而不产生除O2以外的其他产物。当将臭氧化用于污染控制中时,这可能很重要,并且在对此类过程进行建模时必须考虑自由基与臭氧的反应。

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  • 来源
    《Environmental Science & Technology》 |2011年第21期|p.9195-9204|共10页
  • 作者单位

    Leibniz-Institut fur Oberflachenmodifizierung (IOM), Permoserstrasse 15, D-04318 Leipzig, Germany;

    Max-Planck-Institut fiir Bioanorganische Chemie, Stiftstrasse 34-36, P.O. Box 101365, D-45470 Miilheim an der Ruhr, Germany,Instrumentelle Analytische Chemie, Universitat Duisburg-Essen, Universitatsstrasse 5, 45117 Essen, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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