Isomeric Product Detection in the Heterogeneous Reaction of Hydroxyl Radicals with Aerosol Composed of Branched and Linear Unsaturated Organic Molecules
作者:Theodora Nah、Haofei Zhang、David R. Worton、Christopher R. Ruehl、Benjamin B. Kirk、Allen H. Goldstein、Stephen R. Leone、Kevin R. Wilson
DOI:10.1021/jp508378z
日期:2014.12.11
hydroxyalkyl radical. In addition, allylic alkyl radicals, formed from H atom abstraction reactions by hydroxyalkyl or OH radicals play important roles in the chemistry of product formation. Functionalization products dominate the squalene reaction at ∼1% [O2], with the total abundance of observed functionalization products being approximately equal to the fragmentation products at 10% [O2]. The large
研究了不饱和有机气溶胶非均相氧化过程中分子结构(支链或线性)对产物形成的影响。由角鲨烯(C 30 H 50,具有六个C═C双键的支链烯烃)和亚麻酸(C 18 H 30 O 2,具有三个C═C双键的线性羧酸)反应形成的颗粒相产物异构体使用二维气相色谱-质谱法鉴定和定量带有OH自由基的化合物。在低和高[O 2 ]时测量反应(〜1%对10%[O 2])了解羟烷基和羟过氧自由基中间体在产物形成中的作用。关键的反应步骤是将OH加成C═C双键以形成羟烷基基团。另外,由H原子抽象反应通过羟烷基或OH自由基形成的烯丙基烷基自由基在产物形成的化学中起重要作用。官能化产物以约1%[O 2 ]占主导地位,在角鲨烯反应中,观察到的官能化产物的总丰度大约等于10%[O 2 ]时的裂解产物。10%[O 2时,大量的角鲨烯裂解产物]归因于叔羟基烷氧基自由基中间体的形成和离解。对于亚麻酸气溶胶,官能化产物的形成在1%和10%[O