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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Rate coefficients for the gas-phase reaction of hydroxyl radicals with 2-methoxyphenol (guaiacol) and related compounds
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Rate coefficients for the gas-phase reaction of hydroxyl radicals with 2-methoxyphenol (guaiacol) and related compounds

机译：羟基与2-甲氧基苯酚（愈创木酚）及相关化合物气相反应的速率系数

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摘要

2-Methoxyphenol (guaiacol) and its derivatives are potential marker compounds for wood smoke emissions in the atmosphere. To investigate the atmospheric reactivity of this type of compounds, rate coefficients for their reactions with hydroxyl (OH) radicals have been determined at 294 ± 2 K and 1 atm using the relative rate method with gas chromatography for chemical analysis. The rate coefficients (in units of cm~3 molecule ~(-1) s~(-1)) are: 2-methoxyphenol, (7.53 ± 0.41) × 10~(-11); 3-methoxyphenol, (9.80 ± 0.46) × 10 ~(-11); 4-methoxyphenol, (9.50 ± 0.55) × 10~(-11); 2-methoxy-4-methylphenol, (9.45 ± 0.59) × 10~(-11); and methoxybenzene, (2.20 ± 0.15) × 10~(-11). The estimated atmospheric lifetime for 2-methoxyphenol is ～2 h, indicating that it is too reactive to be used as a tracer for wood smoke emissions. The reactivity of the methoxyphenols is compared with other substituted aromatics and interpreted in relation to the type, number, and positions of the different substituents on the aromatic ring. The atmospheric implications of the reactions are also discussed.
机译：2-甲氧基苯酚（愈创木酚）及其衍生物是大气中排放木烟的潜在标志物。为了研究这类化合物在大气中的反应性，使用相对速率法和气相色谱法对化学分析进行了测定，它们与羟基（OH）自由基反应的速率系数为294±2 K和1 atm。速率系数（以cm〜3分子〜（-1）s〜（-1）为单位）为：2-甲氧基苯酚（7.53±0.41）×10〜（-11）; 3-甲氧基苯酚（9.80±0.46）×10〜（-11）; 4-甲氧基苯酚，（9.50±0.55）×10〜（-11）; 2-甲氧基-4-甲基苯酚，（9.45±0.59）×10〜（-11）;和甲氧基苯（2.20±0.15）×10〜（-11）。 2-甲氧基苯酚的估计大气寿命约为2 h，这表明它的反应性太强，无法用作木材烟雾排放的示踪剂。将甲氧基苯酚的反应性与其他取代的芳族化合物进行比较，并根据芳环上不同取代基的类型，数量和位置进行解释。还讨论了反应对大气的影响。

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