Kinetics of the reactions of OH radicals with 2-methoxy-6-(trifluoromethyl)pyridine, diethylamine, and 1,1,3,3,3-pentamethyldisiloxan-1-ol at 298 ± 2 K
Kinetics of the reactions of OH radicals with 2-methoxy-6-(trifluoromethyl)pyridine, diethylamine, and 1,1,3,3,3-pentamethyldisiloxan-1-ol at 298 ± 2 K
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DOI：
10.1002/kin.20594
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发表时间：
2011-11
影响因子：
1.5
通讯作者：
E. C. Tuazon;Pilar Martin;S. M. Aschmann;J. Arey;R. Atkinson
中科院分区：
文献类型：
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作者：
E. C. Tuazon;Pilar Martin;S. M. Aschmann;J. Arey;R. Atkinson
用相对速率法测定了2 -甲氧基- 6 -（三氟甲基）吡啶、二乙胺和1,1,3,3,3 -五甲基二硅氧烷- 1 -醇与OH自由基在298±2 K下的反应速率常数。2‐甲氧基‐6‐（三氟甲基）吡啶的测量速率常数（cm3分子−1s−1）为（1.54±0.21）× 10−12，二乙胺的测量速率常数为（1.19±0.25）× 10−10,1,1,3,3,3‐五甲基二硅氧烷‐1‐醇的测量速率常数为（1.76±0.38）× 10−12，其中指出的误差是估计的总体不确定度，包括参考化合物的速率常数。没有观察到2 -甲氧基- 6 -（三氟甲基）吡啶与气态硝酸的反应，并确定了1,1,3,3,3 -五甲基二硅氧烷- 1 -醇与<7 × 10−20cm3分子- 1s−1的反应速率常数的上限。在12小时的日间OH自由基平均浓度为2 × 106分子cm−3的条件下，本研究中所研究的挥发性有机化合物与OH自由基反应的寿命为：2 -甲氧基- 6 -（三氟甲基）吡啶为7.5天，二乙胺为1.2小时，1,1,3,3,3 -五甲基二硅氧烷- 1 -醇为6.6天。讨论了可能的反应机理。©2011 Wiley期刊公司中国生物医学工程学报，2011,31 (3):531 - 538
Rate constants for the reactions of 2‐methoxy‐6‐(trifluoromethyl)pyridine, diethylamine, and 1,1,3,3,3‐pentamethyldisiloxan‐1‐ol with OH radicals have been measured at 298 ± 2 K using a relative rate method. The measured rate constants (cm3molecule−1s−1) are (1.54 ± 0.21) × 10−12for 2‐methoxy‐6‐(trifluoromethyl)pyridine, (1.19 ± 0.25) × 10−10for diethylamine, and (1.76 ± 0.38) × 10−12for 1,1,3,3,3‐pentamethyldisiloxan‐1‐ol, where the indicated errors are the estimated overall uncertainties including those in the rate constants for the reference compounds. No reaction of 2‐methoxy‐6‐(trifluoromethyl)pyridine with gaseous nitric acid was observed, and an upper limit to the rate constant for the reaction of 1,1,3,3,3‐pentamethyldisiloxan‐1‐ol with O3of <7 × 10− 20cm3molecule−1s−1was determined. Using a 12‐h average daytime OH radical concentration of 2 × 106molecule cm−3, the lifetimes of the volatile organic compounds studied here with respect to reaction with OH radicals are 7.5 days for 2‐methoxy‐6‐(trifluoromethyl)pyridine, 1.2 h for diethylamine, and 6.6 days for 1,1,3,3,3‐pentamethyldisiloxan‐1‐ol. Likely reaction mechanisms are discussed. © 2011 Wiley Periodicals, Inc. Int J Chem Kinet 43: 631–638, 2011